As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2554 - EWR - FLIGHT CREW REPORTED LANDING GEAR AIR GROUND FAIL MESSAGE ON EICAS AND GEAR WOULD NOT RETRACT. CREW PERFORMED AIR RETURN AND LANDED ACFT UNEVENTFULLY. EWR MX REMOVED AND REPLACED NOSE LANDING GEAR STRUT ASSEMBLY AND PERFORMED OPERATIONAL TESTS SUCCESSFULLY. ACFT WAS APPROVED TO RETURN TO SERVICE.