As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 310 - KLAX-KBSM - AFTER TAKEOFF FROM KLAX, AIRCRAFT WOULD NOT PRESSURIZE. AIRCRAFT RETURNED TO KLAX AND LANDED WITHOUT FURTHER INCIDENT. UPON RETURN TO GATE, NOTED L1 ENTRY DOOR JAMMED, PREVENTING ADEQUATE DOOR SEAL. FREED L1 ENTRY DOOR. PERFORMED DOOR LUBE AND RIG CHECK. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE. (M)