What was found
DISCREPANCY: IN CLIMB, THE NR 3 ENGINE START VALVE LIGHT ACME ON. PERFORMED ENGINE SHUT DOWN AND DECLARED AN EMERGENCY. AIRCRAFT RETURNED TO MHR AND LANDED WITHOUT FURTHER DIFFICULTIES. RAN NR 3 ENGINE THREE TIMES AND VERIFIED START VALVE OPEN AND CLOSING. VALVE OPERATED NORMALLY AT THE PROPER TIMES. NO DEFECTS NOTED AT THIS TIME. AIRCRAFT RETURNED TO SERVICE.