What was found
ORD - CREW REPORTED LEFT WING TO BODY OVERHEAT LIGHT ILLUMINATED WITH APU AND WING ANTI ICE OFF AT THE TIME. ACCOMPLISHED QRH PROCEDURES AND LIGHT WENT OFF AFTER LEFT PACK SHUT OFF. AFTER INITIAL DESCENT LIGHT CAME BACK ON AND WOULD NOT GO OUT. EMERGENCY DECLARED FLIGHT LANDED ORD WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND PYLON STRUT WIRE BUNDLE SENSOR DAMAGED. REPLACED M1761 SENSOR. SYSTEM GROUND CHECK NORMAL OPERATION.