As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) TRANSMISSON REMOVED FROM A/C DUE TO METAL CONTAMINATION AND EXCESSIVE NOISE. ON DISASSEMBLY, MAIN INPUT GEAR SHAFT P/N 206040040003 WAS FOUND TO HAVE VERTICAL PLAY. AFTER REMOVING THE SHAFT AND THE DUPLEX THRUST BEARING P/N 2060400321 THE TOP BEARING OF THE THRUST BEARING WAS FOUND TO BE BADLY SPALLED ON ALL THE BALLS. THE VERTICAL MOVEMENT OF THE SHAFT AND RING GEAR ALSO CAUSED EXCESSIVE WEAR OF THE PINON AND RING GEAR.