When the ball drains do you collect your bonus? If you don't, it's a bad switch. Go into Tests --> Switch Edge tests and test the switch with your finger to make sure it works first. If it does, test with a ball and make sure the ball is pressing on the switch properly to activate the switch. If not, bend the actuator so the ball activates the switch. You may also want to check for a broken wire or diode on that switch and resolder if it came off.

If you do get a bonus, but the solenoid doesn't fire, look at the solenoid and make sure the wires on that coil are attached. Could also be a wire on the coil upstream of that coil that came off or broke. If you go into Tests --> Solenoid tests check solenoids 1-8. Do the other coils work? (Ramp diverter, Trap door open, trap door closed, knocker, lock diverter). If all those don't work check fuse F105. Game off, remove one end of the fuse, check continuity with an ohmmeter. If it's bad replace it with a 5A SB fuse.

Let's see then. Check the voltage at the coil by setting your meter to voltage (use a setting over 50V if you have a choice). Touch the black lead to ground (any metal exterior trim) and the red lead to one of the tabs on the coil. I don't know if this game uses 25 or 50 volts on the outhole, but you should at least get a substantial reading.

If not, you have a broken solder joint. Follow the wires in both directions from the coil and see where it breaks.

If you do have voltage, you have a bad driver transistor.