As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAX - FLT 31 - AFTER DEPARTURE AND UPON RAISING GEAR RIGHT MAIN GEAR LIGHT ILLUMINATED RED. RIGHT GEAR PIN INDICATED RIGHT MAIN GEAR DOWN AND LOCKED. RETURNED AND LANDED LAX WITHOUT INCIDENT. REPLACED DOWN LOCK CYLINDER. SYSTEM GROUND CHECK NORMAL OPERATION. (M)