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 GEARBOX BEARINGS AND GEARS. FOUND ROUGH SURFACE AT GEAR TEETH EDGE NEAR RADIUS OF TM GEAR, CAUSING GALLING ON PINION GEAR AND METAL CONTAMINATION. ASSURE PROPER MACHINE AND MESHING OF GEAR TEETH AT FACTORY.