What was found
LEFT ENGINE IN-FLIGHT SHUTDOWN BY THE CREW DURING CRUISE FLIGHT DUE TO LOSS OF OIL PRESSURE. EMERGENCY WAS DECLARED AND AIRCRAFT DIVERTED TO KGSO. SINGLE ENGINE LANDING WAS UNEVENTFUL. MAINTENANCE FOUND A LOOSE LEFT ENGINE TORQUE MANIFOLD RETURN LINE 'B' NUT. SECURED SAME AND SERVICED ENGINE OIL. ENGINE HIGH POWER RUNS ACCOMPLISHED WITH NO DEFECTS NOTED. PER PWC, ENGINE CHIP DETECTOR AND OIL FILTER INSPECTED WITH NO DEFECTS NOTED. A SUCCESSFUL OPERATIONAL CHECK FLIGHT WAS ACCOMPLISHED, AND AIRCRAFT WAS RETURNED TO SERVICE.