As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ABQ INFLIGHT DFW-LAX. CREW REPORTED LEFT PACK DROPPED OFF LINE DURING FLIGHT AND UNABLE TO REINSTATE. FLIGHT DIVERTED ABQ LANDED WITHOUT INCIDENT. PLACARD LEFT PACK INOPERATIVE PER MEL. FLIGHT CONTINUED ON TO DESTINATION. REPLACED LEFT PACK PRESSURE SHUTOFF VALVE AT DFW ON 01/23/2012. SYSTEM GROUND CHECK NORMAL OPERATION.