What was found
ON CLIMBOUT OF ANC NR 3 ENGINE NACELLE TEMP INDICATED 750 DEGREES F ON BOTH LOOPS WITH FIRE DETECTION LIGHT ILLUMINATED ON PILOT FWD PANEL THEN NR 3 ENG FIRE LIGHT ILLUMINATED WITH FIRE BELL. PERFORMED ENGINE FIRE CHECKLIST AND RETURNED TO ANC THE NACELLE TEMPS COLLARED AFTER FIRE HANDLE PULLED. PERFORMED INSPECTION FOR WIND MILLING CONDITION PER 72-00-00 PAGE 680 M AND MM 71-00-61 PERFORMED INSP OF NR 3 ENGINE BLEED AIR SYSTEM FOUND PRESS RELIEF VLV LEAKING EXCESSIVELY REPLACED PRESS RELIEF VLV PER B747MM 36-11-03 PG 401. INSPECTED NACELLE STRUT PRESS RELIEF DOORS OPEN CONDITION PER MM 5-51-28. LEAK CHECK GOOD PER MM 36-11-00.