OK, here's the story, game plays great other than this one issue. Periodically during game play, the flippers will go dead and the bonus for that ball rewarded, almost as if the ball drained even though it didn't. I replaced the ball trough switched, that didn't do it, and they all function fine during the diagnostics. The problem got worse when I fixed the shaker motor, seems like the issue happens when the crane is moving or the shaker is functioning, so I'm thinking a switch adjustment. No tilt or other animations appear on the display so I don't think it would be elsewhere. I guess my question is could this be related to a different switch? Could it be the IC that controls the switch matrix? A possibly related issue is that sometimes, if you hit both flippers at the same time, the shooter coil will fire, this is acceptable when launching a ball, but should not be happening during game play. Thoughts?