What was found
ON FLIGHT 3876 THE CREW REPORTED THAT DURING THE APPROACH TO ORD SELECTED FLAP SLAT SELECTOR TO POSITION 1 AND GOT SLATS FAIL MESSAGE ON EICAS. THE CAPTAIN DECLARED AN EMERGENCY. CRASH, FIRE AND RESCUE WERE CALLED. THE AIRCRAFT LANDED SAFELY WITHOUT INCIDENT. THE AIRCRAFT TAXIED TO GATE ON OWN POWER. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE NR 1 SLAT ACTUATOR AT TRACK 3-3 RIGHT SIDE IAW CRJ-700AMM 27-81-09. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.