BillDurant

WVZR-1

One motor! 2 transmissions/links. Your issue should be visible through the cowl screen I'd think. If you have the FSM you should have 'no issues' resolving the problem.

hcbph

Slim chance - have you tried the wipers with the hood up? Seen where one side hangs and the other doesn't, though I'd expect it would stop both wipers. Anyway, try it and see if the mechanism works the arm or not.