As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TURBINE REMOVAL IT WAS DISCOVERED THAT THE EPOXY WAS MISSING FROM THE GOVERNOR DRIVE ADAPTOR AND THAT THERE IS EXCESSIVE SPLINE WEAR BETWEEN THE ADAPTOR AND THE GOVERNOR DRIVE SHAFT. THE EPOXY PIECE WAS RECOVERED FROM THE ENGINE GEARBOX GOVERNOR DRIVE GEAR. GOVERNOR WAS REPLACED.