As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON DISASSEMBLY AND INSPECTION OF THE GEARBOX PARTS, HOUSING INSPECTION FOUND BRONZE LIFTING FROM TACK GEN. PAD. POSSIBLE CAUSE FOR BRONZE PLATING UNBONDING IS DUE TO SURFACE CORROSION ON HOUSING AND OIL ACCUMULATION UNDER BRONZE DEBONDS PLATING.