As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BNA - INFLIGHT PHL-DFW. CREW REPORTED TAIL TEMPERATURE OVERHEAT LIGHT ILLUMINATED. EMERGENCY DECLARED FLIGHT DIVERTED BNA LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED DUCT 1684 AND REPAIRED LEAK ON RIGHT AIR CYCLE MACHINE. SYSTEM GROUND CHECK NORMAL OPERATION.