What was found
LOWER AFT BODY OVERHEAT LIGHT CAME ON IN FLIGHT WITH WING ANTI-ICE ON. TURNED OFF WING ANTI-ICE, LIGHT WENT OUT. TURNED ENGINE NR 1 WING ANTI-ICE ON LIGHT CAME BACK ON. SECURED SYSTEM THEN RECHECKED WITH ENGINE NR 3 WING ANTI-ICE ON, LIGHT CAME BACK ON AGAIN. REMOVED KEEL BEAM PANEL AND PANELS IN AFT CARGO COMPARTMENT. LEAKED CHECKED ANTI-ICE LINE FROM AIRSTAIR AREA TO KEEL BEAM AREA NO LEAKS FOUND. DID FIND LOOP TOUCHING ANTI-ICE LINE IN KEEL BEAM REPOSITIONED LOOP AWAY FROM LINE. OPERATIONAL CHECKS GOOD ON GROUND RUN NEEDS PANELS REINSTALLED. REINSTALLED KEEL BEAM PANEL AND AFT CARGO COMPARTMENT PANELS.