As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CHIP LIGHT LUMINATED, HAVING METAL IN OIL. UPON DISASSEMBLY OF GEARBOX, FOUND EXCESSIVE GALLING ON GEAR TEETH (PINION GEAR). EXCESSIVE GALLING ON PINION GEAR DUE TO IMPROPER GEAR MESHING AND EXCESSIVE LOAD TO TORQUE AREA. INSURE GEAR HARDNESS AND PROPER MESHING OF GEAR TEETH.