As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OMA - FLIGHT 2145, THE CREW REPORTED A LANDING GEAR AIR GROUND FAIL MESSAGE ON TAKEOFF. THE AIRCRAFT RETURNED TO OMA WHERE IT LANDED WITHOUT INCIDENT. THE CREW SUCCESSFULLY RESET THE AIR GROUND SYSTEM PER MAINTENANCE CONTROL, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.