As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TAIL COMPARTMENT TEMPERATURE HIGH LIGHT ILLUMINATED AT 29,000 FEET. CREW SHUT DOWN LEFT PACK AND CABIN PRESSURE BEGAN TO RISE. CREW DECLARED AN EMERGENCY AND DESCENT WAS MADE TO 10,000 FEET. FLIGHT WAS DIVERTED TO MEM, AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND LEFT AIR CYCLE MACHINE LEAKING. DEFERRED LEFT PACK PER MEL 21-1A.