What was found
(CAN) DURING CRUISE FLIGHT, CREW NOTED SOUNDS OF OUT OF SYNC PROPS, AND FLICKERING OIL PRESSURE. MASTER WARNING LOW OIL PRESSURE ANNUNCIATOR ILLUMINATED FOLLOWED BY A CREW SHUTDOWN OF THE L/H ENGINE. MAINTENANCE REVEALED, REDUCTION GEARBOX CHIP DETECTOR COVERED IN LARGE METAL, REDUCTION GEAR BOX FINGER SCREEN AND ENGINE OIL FILTER CONTAMINATED WITH METAL. ENGINE OIL FOUND DRIPPING FROM ENGINE INLET.