What was found
WITH NR 1 AND NR 2 ENGINES RUNNING, STARTED NR 3 ENG AND THEN NR 2 FLAMED OUT. RESET FUEL SHUTOFF VALVE CIRCUIT BREAKER AND STARTED ENG, CONTRACT MTC CKD FUEL S/O VLV OPERATION. CKD ENG FOR FUEL LEAKS. CKD INTAKE/EXHAUST. ALL OK. STARTED ENG SEVERAL TIMES, ALL WAS NORMAL. SUBSEQUENT OCCURRENCE, MTC FOUND DEFECTIVE START LEVER SWITCH. REPLACED SWITCH OPERATION NORMAL.