What was found
DURING CLIMB, LEFT PROPELLER OIL PRESSURE LIGHT ILLUMINATED FOLLOWED BY ENGINE RPM DECREASE AS THE PROPELLER BLADE ANGLE INCREASED TOWARD THE FEATHER POSITION. THE ENGINE WAS SHUTDOWN AND THE PROPELLER MANUALLY FEATHERED IAW APPROPRIATE CHECKLIST. A SINGLE ENGINE LANDING WAS ACCOMPLISHED WITHOUT INCIDENT. FOUND THE GEAR TEETH ON THE PROPELLER GEARBOX OIL LUBE AND PITCH CONTROL PUMP WORN. REMOVED AND REPLACED LEFT ENGINE. (M)