Quoted from Tango:I was first going to reseat all the connectors, especially around the sound board, but there are so many, and it seems like a long shot, any similar experience or thoughts about what might be causing the issue?
It's a decades-old pinball machine... reseating connectors is standard practice, not a long shot. Connectors and connection points are one of the few places in an electrical system that are going to be directly affected by physically moving the machine.