As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEARBOX WAS RECEIVED FOR CORRODED STUDS. UPON INITIAL VISUAL INSPECTION FOUND SPALLING PINION GEAR TEETH. EXCESSIVE SPALLING AND LIGHT GALLING ON GEAR TEETH DUE TO IMPROPER MESHING OF TM AND PINION GEARS. ASSURE PROPER MESHING OF GEAR TEETH AT FACTORY.