What was found
ON FLIGHT 3524 DURING THE APPROACH THE CREW REPORTED, RECEIVED A SLAT FAIL CAUTION MESSAGE. THE AIRCRAFT LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE 2 SLAT ACTUATOR AT TRACK 1-3 IAW CRJ 700 AMM 27-81-09, THE OPERATIONAL CHECK WAS GOOD IAW CRJ 700 AMM 27-50-00. REMOVED AND REPLACED THE RIGHT NR 4 2-3 SLAT ACTUATOR IAW AMM 27-81-09, THE OPERATIONAL TEST WAS OK IAW AMM 27-50. REMOVED AND REPLACED THE NR 5 RIGHT SLAT ACTUATOR IAW AMM 27-81-09, THE OPERATIONAL TEST WAS GOOD IAW AMM 27-50-00. PERFORMED OPERATIONAL CHECK OF THE RIGHT BRAKE/POSITION SENSOR UNIT AND OPERATIONAL CHECK WAS GOOD, IAW CRJ 70 AMM 27-81-03. REMOVED AND REPLACED THE RIGHT BRAKE/POSITION SENSOR UNIT IAW AMM 27-81-03 AND PERFORMED AN OPERATIONAL CHECK OF THE FLAPS AND SLAT SYSTEM IAW 27-50-00. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.