What was found
ON FLIGHT 2847 THE CREW REPORTED THE LANDING GEAR DISAGREE APPROX 2800FT WITH GEAR DOWN SHOWING 3 GREEN MASTER WARNING. THE CREW DECLARED AN EMERGENCY AND LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. COMPLIED WITH FIM TASK 32-32-00-810-803-A OPERATIONAL CHECK LANDING GEAR EXTENSION/RETRACTION SEVERAL TIMES. LEVEL DISAGREEMENT MESSAGE DID NOT APPEAR ON EICAS, POSSIBLE TRANSITORY CONDITION. AT THIS TIME OPERATIONAL CHECK GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.