It was working fine when I bought it then played fine here at home for a couple games until it stopped scoring or doing anything so I unplugged and replugged the power to try to reset it but now only the backglass is lit up with TILT lit up.
The game stopped scoring and responding after a special feature lit up in the yellow rectangle on the backglass when the ball landed in the hole at top of playfield with the 4 lit up then another ball landed in the matching 4 hole in middle of the playfield.
The three fuses showed continuity with the multimeter tester. Could it be one of the stepper units? One of the tilt switches?
I have the schematic copy from PB Resource and I can post scans of it here or photos of the parts of the game you want to see. The scoring motor is apparently underneath the playfield and I see 10,000 and 100,000 steppers plus replay and point steppers in the backbox.