As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLIGHT 3929, THE CREW REPORTED THAT ON CLIMB-OUT A LANDING GEAR AIR GROUND FAIL MESSAGE APPEARED ON THE EICAS. THE CREW VERIFIED NORMAL OPERATION OF THE GEAR AND CONTINUED TO IAH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE ADJUSTED THE LEFT HAND MAIN LANDING GEAR PROXIMITY SWITCH, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.