As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED THAT THE LANDING GEAR WOULD NOT RETRACT. THE AIRCRAFT RETURNED TO BNA AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE ELECTRICAL CONNECTIONS TO BE LOOSE ON THE LT MAIN GEAR UPLOCK BOX. THE AFFECTED CONNECTORS WERE CLEANED AND RECONNECTED, THE LANDING GEAR SYSTEM OPERATIONALLY TESTED, AND THE AIRCRAFT RETURNED TO SERVICE.