As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHX - CREW REPORTED AIRCRAFT HAVING PRESSURIZATION PROBLEMS WITH NO COOLING AIR FROM EITHER PACKS. RIGHT PACK ALREADY ON PLACARD. EMERGENCY DECLARED RETURNED PHX LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED BOTH LEFT AND RIGHT AIR CYCLE MACHINES. SYSTEM GROUND CHECKED NORMAL OPERATION.