As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON REMOVAL OF AN ALTERNATOR FOR AN INTERNAL OIL LEAK, THE HUB NUT WAS FOUND TO BE LOOSE, ALLOWING THE THRUST WASHER TO ROTATE BY HAND. THE COTTER PIN REMAINED IN PLACE. THE UNIT WAS REMOVED FROM SERVICE PENDING FURTHER INVESTIGATION.