As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SFO - CREW REPORTED, UNABLE TO PRESSURIZE AIRCRAFT AFTER DEPARTURE. AIRCRAFT RETURNED TO STATION WITHOUT INCIDENT. MAINTENANCE RESECURED LOOSE CARGO DOOR SEAL. AIRCRAFT PRESSURIZATION SYSTEM OPERATIONAL CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE. (M)