It sounds like the trough switch activates the Player Reset Re. as it should according to the schematic. Presumably the Player Reset Re. activates the score motor.

Once active, a switch on the Player Reset Re. holds the relay active until all four paths on the R-BLU (red-blue) wire open. It looks like the normally closed switch on the score motor is intended to keep the relay active until the other three paths have had a chance to do their thing. When the score motor switch finally does open, probably late in the score motor rotation, the Player Reset Re. should release.

The problem is likely in one of the four paths on the R-BLU wire. Either the score motor switch isn't opening (or is shorted somehow), or a switch in the other three paths is remaining closed so that even when the score motor switch opens, the Player Reset Re. isn't allowed to release.