What was found
SHORTLY AFTER DEPARTURE FROM COS, FLIGHT SUFFERED A COMPLETE LOSS OF SYSTEM A HYDRAULIC PRESSURE. FLIGHT CONTINUED TO DEN. DECLARED AMBER ALERT. LANDING WAS UNEVENTFUL, AIRCRAFT TOWED TO GATE. *S/D* REPLACED RIGHT FLAP DRIVE MOTOR. CHECKED CASE DRAIN AND PRESSURE FILTERS PER MAINTENANCE MANUAL. FILTERS CLEAN, NO LEAKS NOTED. RAN FLAPS AND PRIMARY FLIGHT CONTROLS SEVERAL TIMES TO WORK AIR OUT OF SYSTEM. OPS CHECK OK. RAN ENGINES AND SERVICED HYDRAULIC SYSTEM.