Neither right flipper moves at all, though the left flippers work and about 42 V is present at the coils and the cabinet button wire.

Both right flippers dead with power present: dirty cabinet button contacts

Cause: The right cabinet flipper switch contacts were dirty enough to pass no current, even though they looked clean.

Checks

• Since the left flippers work, the flipper relay is fine; check the right button switch contacts and the EOS contacts.
• Reflow the flipper connector header on the driver board while you're there.

Fix

• Clean (or replace) the cabinet flipper switch contacts.

Systems

• Bally MPU AS-2518-35

Games

• Spy Hunter

Related tips

• GI dims whenever the left flipper button is held: upper left flipper EOS not opening
• Both right flippers dead, left works: wire at a coil lug not making contact
• Flipper won't kick but holds if lifted by hand: dirty or worn EOS switch
• One flipper dead with full voltage at the coil: cracked joints at the flipper relay
• Right flipper dead though coil and switches test fine: cracked joint on a backbox board
• Flipper coil diodes must be fitted the right way
• Flipper sometimes ignores the first button press: replace the EOS switch
• Flipper weak, dead, or machine-gunning

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