What was found
ALB/IAD - FLT 6255 - DURING APPROACH FLIGHT AT 1120 HOURS ON 8-27-96, ABORTED APPROACH DUE TO SELECTING FLAPS TO 20 DEGREES, FLAPS SLOWLY CONTINUED TO 35 DEGREES. MAINTENANCE TROUBLESHOT AND INSPECTED FLAPS. REMOVED AND REPLACED THE ACTUATOR, LOCK VALVE, EMERGENCY RELIEF VALVE, SELECTOR VALVE, WARNING HORN, AND UNLOCK LIGHT. ALL SYSTEMS FUNCTIONED PROPERLY IAW MM. MAINTENANCE THEN RELEASED THE AIRCRAFT FOR SERVICE. REF: OPERATOR CONTROL NRS VTZA96343, 96ZZZX5167, 96ZZZX5168, 96ZZZX5169, AND 96ZZZX5170.