As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOT FELT ENGINE VIBRATION, 30 MINUTES INTO THE FLIGHT, WITH CLIMB OF T.O.O. TURN BACK FOR LANDING. ENGINE OIL PRESS FLACTUATE. 6FT ABOVE GROUND THE ENGINE QUIT. THE PILOT DID LOWER AUTOROTATION, NO DAMAGE TO AIRCRAFT AND NO ONE GOT INJURED. INITIAL INSPECTATION WAS DONE AND FOUND THAT COMPRESSOR BLADES WERE DAMAGED AND NR 1 BEARING AND SEAT FAILED. ENGINE ASSY REMOVE /REPLACED /SENT FOR EVALUATION.