As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 3348 SBP/LAX, PILOT REPORTED THAT AFTER TAKEOFF THE LANDING GEAR WOULD NOT RETRACT. THE AIRCRAFT RETURNED TO THE FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE PERSONNEL DETERMINED THAT THE LEFT MAIN LANDING GEAR RADIUS ROD SHUTTLE VALVE HAD FAILED. THE VALVE WAS REPLACED, GEAR SWINGS WERE PERFORMED AND OPERATIONAL CHECKS OF THE SYSTEM WERE SATISFACTORY. AIRCRAFT WAS RETURNED TO SERVICE.