As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAX - CREW REPORTED AUTO FAIL LIGHT ILLUMINATED ON THE PRESSURIZATION CONTROL PANEL. EMERGENCY DECLARED FLIGHT RETURNED LAX LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED AUTO FAIL RELAY AND CABIN CONTROL PANEL. SYSTEM GROUND CHECK NORMAL OPERATION.