As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PROPELLER WAS SHOWING SIGNS OF ERRATIC PITCH CHANGE AND STICKING. BLADE SHOWS EVIDENCE OF PREVIOUS IMPACT STRIKE. THIS AIRCRAFT HAD PREVIOUSLY HAD A STUCK PRESSURE RELIEF VALVE IN THE GOVERNOR WHICH, AFTER DISCUSSION WITH THE PILOT, MAY HAVE CAUSED AN OVERSPEED TO THE PROPELLER.