As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT DURING TAKEOFF, RECEIVED AN AIR GROUND FAIL MESSAGE WITH ASSOCIATED REV DISAGREE MESSAGE ON EICAS. DECLARED EMERGENCY, RETURNED AND LANDED WITH OUT INCIDENT. VR 300' IAW MINUTE AT LANDING. ACFT REMOVED FROM SERVICE. R & R NLG WOW HARNESS IAW AMM 32-00-03 & PROXIMITY SENSOR. PERFORMED OPS TEST 32-63-00 AND 32-30-00. THE OPS CHECKED GOOD. NO DEFECTS NOTED. ACFT RETURNED TO SERVICE.