As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT AIR TURNBACK, DURING CLIMB AT 8,000 FT THE (TAIL COP TEMP HI) COMES ON. IT WAS VERIFIED BY LEAKS AND THE ENGINE EXTINGUISHER WAS CHECKED ON HIGH TEMPERATURE DECAL. NO LEAKS WERE DETECTED. THE LT AIR CONDITIONING PACK WAS DEFERRED BY MEL. THE PRESSURE REGULATOR VALVE WAS REPLACED IAW MM.