As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AIRCRAFT 6812, L/P 1371658) R4 DOOR WILL NOT ARM. CORRECTIVE ACTION: GIRT BAR MECHANISM ADJUSTMENT WAS PERFORMED PER B757-200 AMM 52-11-25-825-001 STEP F (1). SYSTEM TEST WAS PERFORMED PER B757-200 AMM 52-11-25-735-024 AND ARMED IS OK.