As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
COS - FLT 1332 - EN ROUTE FROM COS TO CPR, FLIGHT CREW RECEIVED ACAS MESSAGE 'AIRFOIL DE-ICE FAIL' ICING CONDITIONS PREVAILED IN CPR. FLIGHT ELECTED TO RETURN TO COS. AIRCRAFT LANDED COS WITHOUT FURTHER INCIDENT. M8XA MAINTENANCE PERSONNEL INSPECTED AIRCRAFT AND DISCOVERED A FAULTY EJECTOR FLOW CONTROL VALVE RIGHT WING. REPLACED VALVE IAW FAIRCHILD DORNIER MM JIC 30-22-03. GROUND CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE. (M)