The right vertical up-kicker never fires in play. Its switch works, and in solenoid test it does not fire on its own test (4L) but does fire during the test of the flasher that shares its driver (4R).

Right VUK fires only in the paired flasher's test: connector shifted one pin

Cause: The VUK and a flasher share one driver transistor and are selected by the A/C relay. A connector (J2) had been pushed on offset by one pin, so the circuits were swapped.

Checks

• Run the solenoid tests for both halves of the shared driver and note which device fires on which test.
• Check every connector on the board is seated square with no pin left over at either end.
• Compare the wire colours at the connector with the manual.

Fix

• Refit the misaligned connector onto the correct pins.

Games

• The Who's Tommy Pinball Wizard

Related tips

• Unused CPU connector at the upper right on CPU-controlled special coil games

Source: Pinball Repair help group!! (Facebook group)