What was found
LOWER AFT BODY O/H LIGHT ILLUMINATED. FOLLOWED CK LIST PROCEDURE, CLOSED NR 1 BLEED VALVE AND LEFT PACK. RETARDED NR 1 THROTTLE TO CLIMB POWER. LIGHT REMAINED OUT AND TEST OK, INDICATIVE OF LEAK BETWEEN NR 1 BLEED VALVE AND LEFT PACK VALVE. REMOVED AND REPLACED PURGE VALVE, OPER CK AND LEAK CK GOOD. REF M/M 36-13-11. NOTE: VALVE HOT AIR WAS LEAK AT HEAT DETECTOR.