As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING T/O AND INITIAL CLIMB, THE PROPELLER WAS NOT MAINTAINING STEADY RPM. THE PROP. LEVER WAS SET TO FEATHER BUT THE PROPELLER DID NOT FEATHER UNTIL LATER ON FINAL APPROACH, DURING THE RETURN TO THE AIRPORT. AN UNEVENTFUL LANDING FOLLOWED. TROUBLESHOOTING IS ON-GOING AND FOCUSING ON POSSIBLE RIGGING ISSUES.