Quoted from dibenj:
Greetings all, I've had my FP for about 3 years now. Finally springing for the MPU upgrade w/lithium battery. One lingering problem the game seems to have is once you lock 2 balls, the 3rd ball doesn't eject into the firing lane. I'm waiting to see if the MPU replacement with new ROMs fixes that, but just wondering if anyone has seen similar behavior, and what the issue was. Thanx!
Have you cleaned the switches in the trough and kickouts? Maybe one isn't registering properly. Have your boards been serviced and the 40-pin interconnect replaced? That is often a problem in these machines. Also look for AMI branded PIA chips (the large 40-pin chips on the driver board as those are also known to fail.