I need some help finding and fixing this problem.
The game starts and plays normally at first. The issue seems to start when the ball goes into the right lock (the one with the vertical kick). At this point everything seems to go crazy. The right flipper fires the right pop bumper and other switches. The left flipper fires the center pop bumper and other switches. I say other switches because this all happens at once and I can't tell what trigger what. When this starts, the multiple ball starts, the "shoot the ramp" starts, and Millions start. The ramp exit switch also is activated repeatedly while hitting the flippers. Once the ball drains, the weirdness stops. It will, however, start again.
My kids continued to play the machine while it was acting this way. Eventually, the center bumper locked on. I pulled the board out and tested the transistors. Found and replaced one damaged transistor. This fixed the locked-on bumper, but the strangeness continues with multiple thing happening at once.
Can this all be caused by a bad diode? I have read this can cause strange gameplay.