As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAX CREW REPORTED NOSE GEAR WOULD NOT RETRACT AFTER TAKEOFF. EMERGENCY DECLARED FLIGHT RETURNED LAX LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED SHRAEDER VLV & REPACKED LOWER STRUT PISTON WITH NEW SEALS. SYSTEM GROUND CHECKED NORMAL OPERATION CLOSED.