As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THAT AFTER TAKE OFF THEY RECEIVED A GEAR FAULT CAUTION MESSAGE UPON RETRACTING THE LANDING GEAR. THEY RETURNED TO FIELD WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND A STICKING LEFT-HAND UPLOCK SWITCH. THE SWITCH WAS CLEANED AND LANDING GEAR SWINGS PERFORMED WITH NO FURTHER DEFECTS NOTED.