score reels on many williams games are called "drum units", so they are the coil symbols around E9 on the schem.

the single switch that will kill all of them is on the tilt relay ... yellow and white/orange (W-O-5) wires.

if ya stick a voltmeter on the black wire on a score reel coil and other probe on W-O-5 wire on one of the 10/100/1000 pt relay switches and don't see 24VAC, the tilt relay switch is open or you have a plug connection issue.

you should be able to go in the back and manually operate the 10/100/1000 pt relays and have the score added to the active player.