2.) About every 4-5 games a ball will not register as draining. The game goes into ball search mode and takes a while before just ending the ball and ejecting another. It is frustrating as my (admittedly modest by most standards) high score was on two balls. I cursed when I realized I would never know what might have been. A quick glance at the trough didn't really reveal how to address it. Any thoughts?
For issue 2 - as noted check the ball trough switches. They are cherries with rollers, except trough 1 and jam, which are optos. My game arrived with a intermittent trough 1 opto transmitter. When I tapped the trough opto transmitter board I could see the opto flicker. The result was some strange game play including not recognizing drained balls and 2 balls loaded to the shooter lane.