What was found
(CAN) THE AIRCRAFT CAME IN WITH A REPORT OF LOW OIL PRESSURE. THE OIL FILTER WAS PULLED AND INSPECTED WITH NO FAULTS FOUND, THE OIL PRESSURE RELIEF VALVE WAS REMOVED, CLEANED, AND REINSTALLED. THE AIRCRAFT WAS RUN-UP AND FOUND TO BE OPERATING NORMALLY. AT THE 50 HOUR INSPECTION COMPLETED AT 3767.8 HOURS. THE OIL FILTER WAS AGAIN INSPECTED WITH NO FAULTS FOUND BUT TWO LARGE PIECES OF FERROUS METAL WHERE FOUND IN THE OIL DRAIN PLUG. THE ENGINE WAS REMOVED FOR INTERNAL INSPECTION AND THE MAIN BEARING AT THE NR 2 CYLINDER WAS FOUND TO HAVE FAILED. STRIP REPORT AVAILABLE FROM ENGINE SHOP.