As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAX - AFTER TAKEOFF, THE LANDING GEAR FAILED TO RETRACT. LIGHTS REMAINED 3 GREEN. NO OTHER ABNORMAL INDICATIONS. RETURNED TO THE FIELD AND ACCOMPLISHED A UNEVENTFUL LANDING. MAINTENANCE REPLACED THE LANDING GEAR CONTROL PANEL. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.