As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER DEPARTING, THE FLIGHT CREW WAS UNABLE TO MOVE THE LANDING GEAR HANDLE TO THE UP POSITION. THE ACFT RETURNED TO DEPARTURE AND LANDED SAFELY. THE ACFT FERRIED FOR MX. A FAULTY LT GEAR UP PROXIMITY SENOR WAS FOUND DURING TROUBLESHOOTING. THE SENSOR WAS R & R AND TESTED IAW AMM 12-A-32-10-00-00A-903A-A. OPS CHECKED GOOD.