As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GOVERNOR SENT FOR REPAIR DUE TO RPM CONTROL ISSUES AND A HISTORY OF LEAKING. DURING DISASSEMBLY, THE PILOT SPOOL SHAFT THREADS WERE FOUND DAMAGED. IT WAS DISCOVERED THAT AT THE PREVIOUS ASSY OF THIS PART, A FINE THREADED B3808-4 NUT WAS USED IN PLACE OF THE REQUIRED B3808 (COARSE THREAD) NUT. THE B3808-4 WAS FORCED ONTO THE PILOT SPOOL DISTORTING AND CROSSTHREADED IT. UNIT WAS REPORTED TO HAVE BEEN OVERHAULED 3/1/94 AND HAD APPROX 200 HOURS TSO.