This is my first time working on a Atari pin and I seem to be having an issue with the bottom thumper bumper (near flippers). When the bumper coil is plugged in, it causes the left, upper eject hole and outhole coils to fire repeatedly. Upon metering the drivers, I found that the farthest right driver is possibly shorted (beeps during continuity test). Can anyone tell me what this driver is responsible for? Also, any ideas to where to start? If I unplug the bumper coil, the game plays just fine.