What was found
AT 3000' IN CLIMB, LOWER AFT BODY OVERHEAT LT ILLUMINATED. RAN COM 2, 3, 6, 5, AND LT EXTINGUISHED. RETURNED TO IND. FOUND DISCONNECTED AIR DUCT IN AFT BAG BIN. REPLACED COUPLER. FUNCTIONAL TEST WING ANTI-ICE SYS CHECKS NORMAL REF MM 30-13-00.