As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ATER TAKE OFF, CREW ATTEMPTED TO RAISE LANDING GEAR, CREW OBSERVED NO GEAR UP AND LOCKED INDICATION GEAR IND DOWN AND LOCKED CONTINUOSLY W/ GEAR IN TRANSIT ILLUM UNTIL GEAR HANDLE BACK IN DOWN POSITION CREW LANDED IN ART WITH NO FURTHER INCIDENT. MAINTENANCE ADJUSTED THE LEFT MAIN LANDING GEAR UPLOCK SWITCH.