As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE WAS REPORTEDLY MAKING METAL. UPON DISASSEMBLY AND INSPECTION OF THE GEARBOX, FOUND THE POWER PINION GEAR HAD ONE OF THE TEETH BROKEN OFF. FRACTURE APPEARS TO HAVE STARTED BELOW THE BASE OF THE GEAR TOOTH. SUBMITTER STATED CAUSE UNKNOWN.