Game was abandoned because ball was stuck. Looks like there was some sort of missing post. I swapped in a spare star post.
Fixing this requires figuring out what used to be there, getting one, and putting it in
Leveled playfield.
Applied contact cleaner to both potentiometers and turned them a bunch. Both speech and sound effects seem good. Note that this one also has a volume knob inside the coin door, so the pots should only be used to adjust voice vs effects.
Ordered contact cleaner.
ball 1 drop target spring missing
Cleaned play field
Replaced pop number cap on top right, and top left, swapped player 3 and 4 displays and they work now
(Replacement LED display was dim, probably by design, but in troubleshooting Nick discovered swapping 3 and 4 fixed it, perhaps had been loose?)
Tuned left slingshot
Replaced 1 Ball spring to hopefully fix sticking up dropdown target
Playing volume level erratic. When not playing, low crackles from speaker