Even though it didn't ship with one, Iron Maiden has supported a lockdown bar button for a long time (maybe since the beginning?) to launch the ball and enter high scores, etc. However there was never code support for lighting, even though lighting worked in the diagnostics. I added a button almost 2 years ago and it worked great for location players used to having it there, but the lack of lighting was a bummer.

Keith has graciously added lighting support to the button with the new code release for crazy people like me that installed a lockdown bar button. So now that it's officially there and both functions AND lights, here's the how-to with a list of stuff you need to do it on your machine and join me in crazytown...

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EDIT Dec 2023:
Terry at Pinball Life graciously came up with two kits that include everything you would need to do this mod, UNLESS you have an old maiden, where you need these kits AND a receiver bar with a hole in it, which the original runs do not have. You need both of these for current runs, or both of these AND the receiver (515-7792-00) if you have an old maiden.

Product ID: 511-2014-00:
https://www.pinballlife.com/stern-actionfire-button-switch-and-lamp-assembly-with-harness.html
And
Product ID: 500-2440-00:
https://www.pinballlife.com/stern-dual-latch-lockdown-bar-with-action-button-hole.html

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NOTE: These are prices when I did this almost two years ago, they may be more now. The parts total was $136.97 to do this mod, and I ended up with a spare original non-button lockdown bar and receiver. I got most of this stuff from Terry at pinball life. A number of items are non-stocked and have to be special-ordered.

NEW LOCKDOWN AND RECEIVER ASSEMBLY
500-2440-00 $65.00 Lockdown Bar (part numbers on this change per machine, but part is the same. If this is OOS, try a different machine's PN)
515-7792-00 $25.00 Lockdown Bar receiver (2023 re-run has this already from the factory)

SWITCH ASSEMBLY
535-0559-00 $8.95 Action button Leaf switch bracket
180-5218-00 $12.95 Action button leaf switch
545-6268-00 $0.49 Fische Paper for leaf switch

BUTTON ASSEMBLY
545-7291-00 $3.95 Top Button Bar
515-7791-00 $6.95 Clear Top Button
545-7292-10 $3.05 Top Button Spacer Ring
240-5003-01 $0.35 Pal Nut
240-5104-00 8-32 KEPS Nut Hardware Store
036-5600-17 $4.41 Wire harness from coin board to switch/RGB Light

LED ASSEMBLY
535-0368-00 $3.99 Top Button LED bracket
545-6268-01 $0.49 Fische Paper for LED Board Use 545-6268-00
520-5333-00 $1.39 Tri Color LED Board

Here's how to assemble the new lockdown bar with the button:
lockdown-asssembly (resized).jpg

Then you need to make it so the machine can accept the new button-type lockdown bar. If you have the 2023 run Maiden skip the receiver replacement, they ship with the receiver with the cutout already.

Original receiver here has no square cutout for the button and the light to come through:
receiver1 (resized).jpg

You'll need a 1/4", 7/16" and 3/8" sockets to remove the screws and nuts holding the old receiver in place.
receiver bottom (resized).jpg

Once the old one is out, install the new replacement receiver that allows for a button and light:
new-receiver (resized).jpg

Soldering the RGB board to the wiring harness from Stern, you want to connect the striped wired to their matching red, green, blue connectors and the solid red wire to the 5v pad
rgb-board (resized).jpg

Now solder on the leaf switch connectors
leaf-switch (resized).jpg

Then plug the harness into the coin door interface board here:
coin door interface board (resized).jpg

Then attach the LED board and leaf switch to the receiver, which has threaded posts to hold the bracket they attach to.

Go into the ADJUSTMENTS on the system menu and turn these two on so the light will work in attract mode, too:
- standard adjustment #55 - start button attract mode illum
- feature adjustment #168 - start game from lockdown button

Enjoy your Iron Maiden with the working lockdown bar action button installed!
working_button_no_light.jpg

All done with this project? Here's a couple other DIY guides I've made for newer Spike machines:

Are LED lights popping out of your spotlights (not just on Spike machines!)? Make sure they never fall out again:
https://pinside.com/pinball/forum/topic/fixing-led-bulbs-flashers-that-fall-out-of-spotlights#post-4402506

Have a Stern machine from KISS or after with the softer wood cabinet? Reinforce it to prevent a splitting cab:
https://pinside.com/pinball/forum/topic/reinforcing-stern-cabinet-legs-step-by-step

Are your Iron Maiden speakers crackling when you crank it up? Fix that with a cheap external amp:
https://pinside.com/pinball/forum/topic/replacing-on-board-amp-with-external-amp-for-iron-maiden

Is your Spike machine occasionally resetting during hectic play, torpedoing your high score runs? This guide to fixing it might be for you:
https://pinside.com/pinball/forum/topic/fixing-stern-reboots-on-spike

Do you have a WoZ ECLE and think it's too loud in a quiet room? Replace two fans and make it almost silent:
https://pinside.com/pinball/forum/topic/quieting-down-a-woz-ecle-machine

Deadpool Katana entrance playfield protection:
https://pinside.com/pinball/forum/topic/protecting-katana-lane-entrance-from-playfield-damage

Awesome. I was able to get the harness through pinball life as a special order, but with the parts shortages maybe they are holding that stuff tighter. At least you were able to work around it. I definitely prefer seeing it with the button there.

They're great for location and for kids. In a home lineup, it's just nice to have your Spike machine formats all match.

There's nothing special about the fish paper, it's just a special kind that insulates. Get a bulk roll of it off ebay and you'll have plenty on hand to cut a piece whenever you need it for like $7.50 shipped.

ebay.com link: itm

Did you email Terry at pinball life to see if he could special order you just the LED bracket? It was a few years since I did it, but I definitely got just the bracket by itself for $3.99. But, honestly, if you have a 3d printer, you can probably make a "good enough" bracket.

Made a note of that in the instructions. Thanks for pointing that out! Saves $25.

Thanks for updating this as you go through it with the current parts situation.

You probably have to turn on the option that allows you to start a new game using the action button for it to blink like the start button does. There's definitely a setting for that.

Other than that, I don't know. It's been too long since I did this and I don't have the machine anymore, so maybe someone can jump in that has also done it.

It's blinking green now in attract mode? If so, you might want to post the adjustment number for posterity, too.

I didn't have IC on the Maiden machine I did, so maybe someone else can chime in.

It's probably just the issue that the small code scraps Keith threw us to make the action button work and light didn't include IC functionality since that didn't exist when this was done. Then, the IC code that was added to Maiden didn't support the action button because the action button didn't ship with the machine.

I'll ask Keith about it, but I don't expect a positive answer about it getting addressed.

Great news. I'll add the links to the OP!