What was found
ON FLIGHT 3717 THE CREW REPORTED THAT ON APPROACH THEY RECEIVED A SLATS FAIL MESSAGE. THE CREW FOLLOWED EMERGENCY PROCEDURES WHILE COORDINATING WITH ATC. AFTER RUNNING THE PROCEDURES THE CREW REPORTED THE MESSAGE WAS STILL POSTED. THE CREW DECLARED AN EMERGENCY AND LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. FOUND LEFT NR 3 OUTBOARD SLAT ACTUATOR TRIP INDICATOR IN TRIP POSITION RESET IAW CRJ AMM 27-81-09. THE OPERATIONAL CHECK WAS GOOD. COMPLIED WITH ETN-CR-27-084 FOR POSSIBLE WATER IN SLAT ACTUATOR. THE AIRCRAFT WAS RETURNED TO SERVICE.