What was found
AFTER A HEAVY MAINTENANCE CHECK, DURING THE ACCEPTANCE FLIGHT, THE LOWER AFT BODY OVERHEAT LIGHT ILLUMINATED DURING CLIMB. THE AIRCRAFT COULD NOT MAINTAIN THE CABIN WITH ONE PACK. THE MAX AIRCRAFT ALTITUDE 19,000 FT AND THE MAX CABIN ALTITUDE 7,000 FT. REMOVED AND REPLACED THE NUMBER TWO BLEED DUCT AND CLAMPS. LEAK CHECKED GOOD, THE A/C PACKS OPERATIONALLY CHECKED GOOD.