As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 7803 - LAX TO LAX - FLIGHT CREW REPORTED KNOCKING SOUND WHEN GEAR RETRACTED - FERRY TO ONT, CHANGED SEVERAL COMPONENTS E.I BCU, RELAY K0273 AND FINALLY REMOVED AND REPLACED LANDING GEAR SELECTOR VALVE. OPERATIONALLY, TEST FLEW CHECKED SATISFACTORY AND AIRCRAFT WAS RELEASED TO RETURN FOR SERVICE.