This problem may be unique. Whenever it's time for multi ball to start, upon kickout into the shooter lane, the trunk registers false hits and spins back and forth. It only does this sometimes and occasionally shaking the machine will make it stop, but not always. It has the "ultimate trunk error opto fix" board and pinbits eddie boards. I bought the machine with these upgrades already installed and am extremely green in pinball repair.

Here's a couple of videos of what it's doing:

https://drive.google.com/open?id=12Ie16mSyqp25u9ZIn464mNVCx53wkLht
https://drive.google.com/open?id=1WehdQJcoYE4m8xZ1vjU_4tpKdDOG29gM

What do I need to look for to diagnose this?

Thanks

Bump?

Ok, I'll see if I can do these things. I'm new at this.

It only registers hits during play when it turns around for the magnet to start multiball. All other times seem flawless.
I've noticed that the Eddy boards are only connected by a single screw, leaving them free to move around. Could this be the culprit? There are no two holes in the board that line up with the previously drilled holes in the playfield.

Thanks for giving me a start. I'm going to the Houston Arcade Expo this weekend, I'll check these switches and optos as soon as I get back.

Ok, when I press test on the 36 switch, nothing happens. What do I need to do now?
Pictures incoming of the screen, the board under the trunk, and the loose eddy board.

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Ok, I was just pushing the button thinking it would test.

I toss a ball in the trunk with the test screen up and it flashes "open" as the ball goes through as I assume it should. It's not stuck closed.

Is there a certain position the eddy board should be in or does it just need to be secure?

I got a tech over and he showed me there is a hairline fracture in the interrupter that I couldn't see. He says it's most likely the culprit. Ordering one from Marco's now.

It wasn't the answer.

I think the original board is in the coin tray. I'll check and see.

If the auto eddy board is too sensitive, then what can I do about it? Will it have to be replaced? I can't find anywhere that has it in stock.