What was found
ON FLIGHT 4199 THE CREW REPORTED, DURING TAKEOFF RECEIVED A LANDING AIR/GROUND FAIL MESSAGE ON EICAS. THE MESSAGE WENT AWAY AFTER APPROX 3 MINUTES. THE CREW DECLARED AN EMERGECNY AND LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE NOSE LANDING GEAR WEIGHT ON WHEELS HARNESS W019 REF EMB AMM 32-00-03. PERFORMED GEAR EXTENSION/RETRACTION CHECK IAW EMB AMM 32-30-00. THE OPERATIONAL CHECK WAS GOOD. NO RELATED MAINTENANCE OR CMC MESSAGES NOTED. THE AIRCRAFT WAS RETURNED TO SERVICE.