As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHX - CREW REPORTED ON CLIMBOUT TAIL COMPARTMENT TEMPERATURE HIGH LIGHT ILLUMINATED. THE LIGHT WENT OUT IN LESS THAN 2 MINUTES AFTER RED BOX PROCEDURE. EMERGENCY DECLARED FLIGHT RETURNED PHX LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND CONDITIONED AIR DUCT BLOWN ON THE RIGHT PACK, IN THE TAIL COMPARTMENT. REPLACED DUCT. SYSTEM GROUND CHECK NORMAL OPERATION.