What was found
JAX - FL 1420 - EN ROUTE FROM MCO-IAD - AT FL 290, THE NR 1 ENGINE OIL TEMPERATURE ROSE TO 140 DEGREES CELSIUS. CREW SHUT DOWN THE NR 1 ENGINE AND DIVERTED TO JAX. FLIGHT LANDED WITHOUT FURTHER INCIDENT. CAPTAINDID DECLARE AN EMERGENCY. TOTAL SINGLE ENGINE TIME WAS 10 MINUTES. MX FOUND THE CANNON PLUG LOOSE ON THE NR 1 ENGINE FUEL HEAT VALVE. RECONNECTED CANNON PLUG. OPS CHECK NORMAL. DRAINED OIL FROM NR 1 ENGINE AND INSPECTED OIL SCREEN FOR FOREIGN MATTER. NONE FOUND. RESERVICED ENGINE WITH OIL. RAN ENGINE, NO LEAKS OR DEFECTS NOTED. (M)