I had a weird problem where any time I hit the saucer the game would end like a slam tilt.

Found that the coil wire in the saucer was touching the housing and shorting out the whole matrix.

Where I’m going with this is try checking all coils associated with any switch along the bottom row and check all wiring for that row and the tilt. There’s probably something touching something else it’s not supposed to. I’d look for obvious stuff like that before the other guys show up and start telling you buy a logic probe and learn quantum physics
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That little red wire on the right caused me head aches for over a week. 6E84013D-7ED1-4C43-817E-54999A927F80 (resized).jpeg

You ever track down the gremlin?