What was found
SUPPLEMENTAL INFORMATION - ON FLIGHT 4339 DURING DESCENT THE CREW REPORTED THAT WHEN EXTENDING THE GEAR RECEIVED A LANDING GEAR DISAGREE MESSAGE ON EICAS. THE LANDING GEAR POSITION INDICATION WAS GREEN. THE CREW DECLARED AN EMERGENCY AND LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. PERFORMED EXTENSION / RETRACTION OF LANDING GEAR MULTIPLE TIMES IAW EMB AMM 32-30-00. REMOVED AND REPLACED THE LEFT NOSE LANDING GEAR DOOR ACTUATOR IAW EMB 140 AMM 32-33-01. NO FURTHER DEFECTS NOTED. THE AIRCRAFT WAS RETURNED TO SERVICE.