Issue: On Simpsons pinball party, the garage door stops opening fully when the machine has been played for a while.

Solution: Made sure all components (door and plunger) are not binding anywhere. Replaced the stock garage coil with the stronger Stern 24-940 coil (there used to be an old service bulletin around which disappeared). Issue resolved.

Issue: Lord of the rings resets mid-play, sometimes at start, sometimes after hours of play.

Solution: Checked voltage on CPU, found it to be 4,9 volts. Reseated all relevant power cables on cpu and power supply, still 4,9 volts. Used the poti R116 on the power supply to raise the voltage to 5,1 volts. Issue never occured again.

(picture taken from purcelvillepinball.com)