What was found
LOWER AFT BODY OVERHEAT LIGHT ILLUMINATED AFTER TAKEOFF AT TAKEOFF THRUST SETTING. RAN THROUGH RED TABS AND ISOLATED NR 2 ENGINE BLEED CAUSES LIGHT TO ILLUMINATE ABOVE 88 PERCENT AT 15,000 MSL. LIGHT REMAINED OUT AS LONG AS NR 2 WAS KEPT AT REDUCED THRUST. FOUND THE NR 2 ENG TOP ANTI-ICE DUCT BLOWN AND FIRE-WALL DAMAGE. INVESTIGATION REVEALED BLOWN NR 2 ENG PNEUMATIC DUCT AND LARGE HOLE IN FORWARD FIRE WALL WHICH ALLOWED BLEED AIR INTO AFT BODY AREA. FIRE WALL DAMAGE REPAIRED. BLEED AIR DUCT REPLACED. NR 2 ENG RUN TO POWER PER JET RUN-UP HANDBOOK AND THERE WAS NO REOCCURRENCE OF AFT BODY OVERHEAT.