As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE WAS RECEIVED FOR MX. CUSTOMER CLAIMED ENGINE WAS MAKING METAL. ENGINE WAS DISASSEMBLED TO INVESTIGATE THE SOURCE OF THE PROBLEM. REMOVED AGB MODULE'S COVER TO INSPECT BEARINGS AND GEARS. FOUND ONE BOLT HEAD SHEARED OFF OF THE TORQUE IDLER GEAR. THE TORQUE IDLER GEAR IS MADE OF 2 GEARS THAT ARE PRESSED FITTED AND THEN SECURED BY 8 THROUGH BOLTS AND NUTS. MOST OF THE (8) NUTS WERE LOOSE AND THERE WERE CHIPPED AREAS ON SOME OF THEM. OEM ENGINEERING HAS BEEN NOTIFIED AND ARE INVESTIGATING THIS MATTER.