As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT AFTER TAKEOFF, RECEIVED A LANDING GEAR AIR/GROUND FAIL MESSAGE. RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE SECURED NOSE LANDING GEAR WEIGHT ON WHEELS PROXIMITY SWITCH ELECTRICAL CONNECTOR. OPS CHECKED LANDING GEAR EXTENSION AND RETRACTION, GOOD WITH NO FURTHER DEFECTS NOTED.