What was found
WHILE AT CRUISE, THE NR 4 ENGINE EXPERIENCED A FLAME-OUT. THE RESTART WAS SUCCESSFUL AND THE FLIGHT CONTINUED TO NRT WITHOUT FURTHER DIFFICULTY. THE ENGINE OPERATION WAS NORMAL FOR THE REMAINDER OF THE FLIGHT. MAINTENANCE INSPECTED THE ENGINE WITH NO DEFECTS NOTED. THE MAIN FUEL FILTER AND TT2 SENSOR WERE REPLACED AND THE AIRCRAFT RETURNED TO SERVICE.