What was found
REPEAT WRITE-UP FROM DISCREPANCY NR 01199454 ENGINE NR 3 STRUT OVERHEAT LIGHT ON. OVERHEAT LIGHT CAME ON PASSING FLIGHT LEVEL 250 AND APPROXIMATELY 20 MINUTES INTO FLIGHT. BOTH PACKS ON NR 1 BLEED OFF, NR 2 OPEN NR 3 OPEN CLIMB POWER WITHIN PARAMETERS. ADMINISTERED RED TABS CHECKLIST AND THE LIGHT WENT OUT. CONTINUED FLIGHT ON ONE PACK FOR REST OF FLIGHT. PULLED NR 3 STRUT PANELS AND RAN ENGINE TO CHECK FOR BLEED LEAKS. NO LEAKS FOUND BUT NR 3 BLEED AIR SHUTOFF VALVE FOUND TO BE INOPERATIVE. REMOVED AND REPLACED NR 3 SHUTOFF VALVE AND OPERATIONAL CHECKED AND LEAK CHECKED NORMAL. RAN NR 3 ENGINE AT HIGH POWER AND STRUT OVERHEAT CHECKS NORMAL. REINSTALLED PANELS, OK FOR SERVICE.