As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING COMPLIANCE WITH AD 96-09-10 IT WAS DISCOVERED THE DRIVE GEAR AND DRIVE SHAFT CONTAINED A KEYWAY. THE KEYWAY AND DRIVE GEAR WERE WORN APPROXIMATELY 0.060". THIS KEYWAY SHOULD HAVE BEEN REMOVED BY AD 75-08-09, BUT THIS ENGINE, BY SERIAL NUMBER, IS NOT APPLICABLE TO AD 75-08-09. A REPLACEMENT DRIVE SHAFT WAS INSTALLED.