Unlike Pinball 2000, you can't see where there's a light out from the diagnostics. You just have to visually inspect for an empty socket. Check the slings and near the outlanes. Common areas the lights come out.

If it came from a spotlight, you can make sure they don't come out again by doing this:
https://www.pinside.com/pinball/forum/topic/fixing-led-bulbs-flashers-that-fall-out-of-spotlights

It’s a wedge base bulb so my guess its a spotlight. Check all the areas that have spotlights and look for missing bulbs.

best thing to do is replace sterns shitty leds with cointaker's in the spotlights. if you want to keep the spotlight bulbs that came with the game, use glue dots on the base to hold them in better. i changed all of my spotlight bulbs on my metallica le with cointaker bulbs and they haven't fallen out since.

I also have a shaker motor on mine and from day one those bulbs never stayed in the spotlights at slings. Tried all sorts of remedies and decided to just keep them out because I got sick of taking the glass off.
-Mike

You could try gently bending the wires back and then wrapping a couple of turns of masking tape around the wedge. Then bend the wires back in place. Should grip better in the holder.

I have the first met pro led and back then they used CT leds...is that not the case anymore?

My solution for this is to lift the metal wires from the bulb out, wrap some electrical tape (cut down to size) around the base, then bend the wires back over. Now when you put it into the socket it will be extremely tight (hard to even get in), which means it should not pop out.

I generally have to do this with all spot lights.

My solution was to put clear packing tape over the front of the spotlight. Haha

Cgc puts a generous amount of hot glue between the bulb and reflector. So either that or the electrical tape trick and you shouldn't have to worry again

I do the same, but with pipe thread tape since it’s a little thinner.

Unfortunately on some stern they cheaped out and used wedge base gi lights and this can happen. A piece of tape around the base usually fixes this.

Do what this guy suggests and dont fret. This is no biggie and very normal. Those wedge bulbs love popping out of the spotlights from vibrations. They just need to he secured better.

P.s. no need to replace them with another brand. That would be a waste of money and accomplishes noth8ng

I’ve never seen a spotlight with a bayonet base.

Talking about gi lights as they can fall out also on the stern pins that used them.... at least my met and star t did. The spots tend to fall out the quickest .

Replacing not necessary and think stock bulbs are from cointaker. Just follow one of the suggestions or just keep popping them back in when they fall out. Very common issue. All the vibrations and gravity work them loose.

I just used a lot of hot glue and it worked great. Haven't fallen out since.

Sockets and bulb bases can vary in production.
Glue, Glue Dots, Silicone or tape will all work.

I have been happy with this stuff, as I had a bunch.

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Art recommended Teflon tape for my ST spotlights and that worked well for the slightly narrower wedge bases.

happy birthday!

Just do what Vireland said and it'll never fall out again.

https://www.pinside.com/pinball/forum/topic/fixing-led-bulbs-flashers-that-fall-out-of-spotlights

I also applied Virelands solution and it works great!

Another known “issue” with these spotlights is that they might turn a bit after a few games. I solved this with a tiny drop of loc-tite on the thread of the hex spacers and spotlight screws.

Yes, this works great. I’ve done this on several Stern machines.