As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE REMOVED FOR EXCESSIVE METAL ON BOTH PLUGS. DISASSEMBLED AND FOUND T/M GEAR TO PINION GEAR GALLING CAUSING METAL CONTAMINATION. SUBMITTER STATES IMPROPER MESHING BETWEEN T/M GEAR AND PINION GEAR WAS CAUSE FOR GALLING. SECONDARY DAMAGE - PINION GEAR P/N 6893672 S/N NN76130, TT: 1,834.7 HOURS.