As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) UNCOMMANDED POWER LOSS IN DEPARTURE LEG OF FLIGHT. PILOT REDUCED POWER TO 55% BUT NOTICED IT ACTUALLY REDUCED TO 35%. PROPELLER RPM DROPPED, ALTHOUGH DROP NOT RECORDED. PILOT CONTINUED FLIGHT TO A FULL STOP LANDING AT DEPARTURE AIRPORT. PILOT PROCEEDED TO DO A RUN UP, BUT DISCREPANCIES COULD NOT BE REPRODUCED OR FOUND. OIL WAS DRAINED FROM GEARBOX AND METAL FLAKES WERE OBSERVED IN OIL AND ON MAGNETIC DRAIN PLUG.