Mobile, AL
If you don't have something leaning against the plumb-bob, it's high probability the tilt switch capacitor is bad.
(Topic ID: 219690)
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With the game off, reseat MPU J4 and the two connectors on the right side of the solenoid board.
Retest.
Still bad?
Very carefully swap U10 and U11 on MPU, using caution not to bend any chip legs underneath the chip.
Any change in behavior?
Of course, all of those connectors need to be rebuilt if they haven't been done recently.
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