As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAX - CREW REPORTED UNABLE TO PRESSURIZE AICRAFT AFTER TAKEOFF. SWITCHED TO AUTO CONTROLLER NUMBER 2 AND THEN TO MANUAL BUT UNABLE TO CONTROL CABIN ALTITUDE. EMERGENCY DECLARED FLIGHT RETURNED LAX LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED E AND E EQUIPMENT COOLING OVERBOARD EXHAUST VALVE. SYSTEM GROUND CHECK NORMAL OPERATION.