As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CREW REPORTED THE MASTER WARNING LIGHT AND TAIL COMPARTMENT TEMP HIGH LIGHT CAME ON INTERMITTENTLY FOR 3 OR 4 CYCLES. RAN QRH CHECKLIST AND LIGHT WENT OUT AFTER 30 SECONDS AND STAYED OFF FOR REMAINDER OF FLIGHT. EMERGENCY DECLARED FLIGHT RETURNED DFW LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED DUCT ASSEMBLY THAT WAS LEAKING. SYSTEM GROUND CHECK NORMAL OPERATION.