As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5837 - RIC - FLIGHT CREW REPORTED LG AIR GRND FAIL MESSAGE ON EICAS AFTER T/O. CREW DIVERTED FLIGHT TO RIC AND LANDED UNEVENTFULLY. RIC MX REMOVED AND REPLACED LGEU AND PERFORMED OPERATIONAL CHECK SUCCESSFULLY. ACFT WAS APPROVED TO RETURN TO SERVICE.