As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2866 - EWR - FLIGHT CREW REPORTED LANDING GEAR AIR GROUND FAIL MESSAGE WHEN GEAR IS IN TRANSIT DOWN. EWR MX REMOVED AND REPLACED THE LANDING GEAR ELECTRONIC CONTROL UNIT AND PERFORMED OPERATIONAL CHECK SUCCESSFULLY. AIRCRAFT WAS APPROVED TO RETURN TO SERVICE.