What was found
(CAN) NR 2 OIL PRESS ERRATIC THEN DROPPED AND WARNING LIGHT CAME ON. OIL PRESSURE STABILIZED AT 15 PSI AND THE PROPELLER RPM ROLLED BACK 2 DURING APPROACH. DURING TAXI IN, OIL PRESSURE DROPPED TO 3 PSI AND THE ENGINE WAS SHUTDOWN. THE NR 2 OIL PRESSURE LIGHT HAD REMAINED ON FOR 20 MINUTES. THE OIL LEAK WAS CAUSED BY A CUT OIL COOLER HOSE O-RING. THE OIL COOLER SHROUD WAS REPLACED THE NIGHT BEFORE. ENGINE REPLACED DUE TO OPERATING WITH LOW OIL PRESSURE. A9270-1, OIL COOLER HOSE, AS3209-222, O-RING.