As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED A LANDING GEAR AIR/GROUND FAIL MESSAGE AFTER TAKEOFF. MAINTENANCE INSPECTED AND COULD NOT DUPLICATE THE PROBLEM. RELAYS KO453, KO353, AND KO025 WERE REPLACED. THE NOSE GEAR WAS RESERVICED AND OPERATIONAL CHECKS WERE GOOD. THE AIRCRAFT WAS TEST FLOWN WITH NO DEFECTS.