As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THEY RECEIVED A LANDING GEAR AIR/GROUND FAIL MESSAGE ON EICAS. THE CREW DECLARED AN EMERGENCY AND LANDED WITHOUT INCIDENT THE ACFT WAS REMOVED FROM SERVICE. PERFORMED GROUND RESET ON EICAS WARNING. PERFORMED NORMAL STANDARD MX PRACTICES. THE ACFT WAS RETURNED TO SERVICE.