Ok I have a AC/DC that's been giving me crap. Backstory is it lost 5 volt on the I/O board. It was repaired but the game said it was in the wrong country. I Sent it to Stern and they sent a replacement. I put the new one in and the Drop targets wouldn't reset. That problem fixed itself and made a new one. The magnet and bell eject would lock on. It made the magnet smoke but it still works. That too fixed itself.
Now im stuck on this one and this could have been there all along since I never got to check the switches till now. The Bell opto. Right pop bumper, tournament switch and the not used switch 63 all show closed in switch test. If I hold the bell so it breaks the opto beam then the pop bumper switch will act normal. If I close certain switches then the pop bumper and the bell opto will work like they should. Heres a video that better shows whats going on with it. Oh and taking the brown/vio wire off the bell connector makes the switches all work normally except the bell opto because its unplugged. so could all this be a bad bell opto? Everything worked fine with the old I/O board.

I swapped the cannon opto for the bell one. The problem moved to the cannon row. So I'll order a new opto board and see where that gets me.