What was found
LOWER AFT BODY OVERHEAT LIGHT CAME ON JUST AFTER FIRST LEVEL OFF. NR 2 AND NR 3 BLEEDS OPEN BOTH PACKS ON, LIGHT WENT OUT AFTER ONE MINUTE BUT CAME BACK ON DURING CLIMB. STARTED RED TAB PROCEDURE, LIGHT WENT OUT WHEN NR 1 BLEED AND LEFT PACK TURNED OFF REMAINDER OF FLIGHT WITH NR 3 BLEED AND RIGHT PACK, LIGHT DID NOT COME BACK ON. THE M366 OVERHEAT DETECTOR WAS REPLACED, SHORT ONE IN KEEL BEAM. ALSO, REPLACED M365 OVERHEAT DETECTOR, RIGHT AFT AIRSTAIR DETECTOR. OPERATIONAL CHECKS NORMAL ON ENGINE AND APU RUNS.