As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER DEPARTURE THE CREW REPORTED THE LANDING GEAR DID NOT RETRACT. THE GEAR HANDLE DID NOT MOVE OUT OF THE DOWN POSITION. THE CREW ELECTED TO RETURN TO DEPARTURE. THE ACFT LANDED WITHOUT INCIDENT. CLEANED PROXIMITY SWITCH 51GB. R & R PROXIMITY SWITCH 54GB AND HARNESS 503GVC IAW JIC 32-61-00. THE OPS CHECK WAS GOOD IAW JIC 32-31-00. THE ACFT WAS RETURNED TO SERVICE.