As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OKC - CREW REPORTED TAIL TEMPERATURE HIGH LIGHT ILLUMINATED DURING CLIMBOUT. EMERGENCY DECLARED FLIGHT RETURNED OKC LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND BOOT OFF RAM AIR Y DUCT AND PIN HOLE IN THE DUCT. REPLACED DUCT. SYSTEM GROUND CHECK NORMAL OPERATION.