As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOLLOWING DISASSEMBLY OF ENGINE FOR METAL CONTAMINATION, DISCOVERED 2 EACH OF THE LOCKCUPS HAD FAILED. CUPS CRACKED AND SPLIT AT THE LOCKING TANGS WHICH ENGAGE THE PLANETARY GEARSHAFTS. THE RETAINING NUTS WHICH THE LOCKCUPS RETAIN, REMAINED IN PLACE AND THE PIECES OF THE LOCKCUPS WERE FOUND IN THE SCAVENGE SCREEN OF THE ACCESSORY DRIVE GEARBOX AND LAYING IN THE OUTPUT REDUCTION GEARBOX.