As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DEPARTURE, THE LANDING GEAR WOULD NOT RETRACT. THE AIRCRAFT RETURNED TO POINT OF DEPATURE AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE UPPER WIRING HARNESS ON THE LT MAIN LANDING GEAR AND THE AIRCRAFT WAS RETURNED TO SERVICE.