What was found
ON FLIGHT 3681 THE CREW REPORTED THAT ON DESCENT THRU FL 180 FLT SPOILER EXTENDED RECEIVED O/B SPOILERONS (LEFT SIDE) REMAINED ON WITH FLT SPOILERS RETRACTED. THE CREW DECLARED AN EMERGENCY AND LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE LEFT OUTBOARD SPOILERON PCU IAW CRJ-MM-26-62-01. ALSO REMOVED AND REPLACED O-RING PART# NAS1612-4, PIN COTTER PART# MS24665-151 & COTTER PIN PART # MS24665-300. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.