As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GOVERNOR FAILED TO CYCLE PROP DURING RUN-UP. AT DISASSEMBLY OF GOVERNOR, GEAR WAS FOUND SHEARED AT THE VALVE SLOTS, JUST UNDER FLYWEIGHT ASSY. IT APPEARS AS THOUGH THE DRIVE GEAR SEIZED IN THE GOVERNOR BODY ABOVE THE SLOTS. CAUSE UNKNOWN. (K)