As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD INFLIGHT T1345/25JUN. CREW REPORTED TAIL COMPARTMENT OVERHEAT INDICATION DURING CLIMB. INDICATION EXTINGUISHED WHEN LT AIR CONDITIONING SWITCH PLACED TO OFF POSITION. RETURNED TO ORD AND LANDED WITHOUT INCIDENT. REPLACED CLAMP AND SHIM AT LT HEAT EXCHANGER INLET. SYSTEM GROUND CHECKED NORMAL OPERATION. (A)