What was found
JFK - FLT 1251 - AFTER TAKEOFF EWR DURING CLIMB-OUT, LOWER AFT BODY OVERHEAT LIGHT ILLUMINATED. ACCOMPLISHED ABNORMAL PROCEDURES AND LIGHT EXTINGUISHED WHEN NR 2 POWER LEVER WAS RETARDED TO IDLE. JETTISONED FUEL AND AIRCRAFT DIVERTED TO JFK, LANDING WITHOUT INCIDENT. REPAIRED NR 2 ENGINE FIREWALL THERMO ANTI-ICE DUCT FOUND CRACKED. SYSTEM GROUND CHECKED NORMAL OPERATION. (X)