The Balrog moves a little on its own and no longer opens or closes properly, and the switch in the multiball hole stops registering.

Balrog twitches and multiball hole switch is dead: wire off the switch

Cause: One of the green wires on the multiball hole switch had come off. Two green wires share that lug, and the broken connection upset the Balrog as well as the switch.

Checks

• Check the multiball hole switch in switch test.
• Under the playfield, look at the wires on that switch; both green wires go to the same lug.
• Also check the Balrog wiring where it passes through the playfield, where moving wires can wear through.

Fix

• Resolder the loose wire to the switch.

Systems

• Sega/Stern Whitestar

Games

• Lord of the Rings

Related tips

• Trough and other switches on one column read open: broken column wire at the trough
• Balrog motor only turns one way: bad joint on the motor relay board

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