What was found
(CAN) DURING APPROACH, FLAP SELECTED TO 35, FOLLOWED BY FLAP DRIVE CAUTION ILLUMINATED AND THE FLAPS STOPPED MOVING. FIM WAS FOLLOWED AND, FCU, FLAP CONTROL UNIT REPLACED. REPEAT EVENT NEXT FLIGHT. LT INBD FLAP BALL SCREW ASSY ROUGH TO TURN WITH TIGHT SPOTS. ALSO LT INBD FLAP, NR 2 BALL SCREW ASSY REMOVED DUE TO SLIGHT ROUGHNESS ALONG WITH LT OTBD FLAP NR 4 BALL SCREW ASSY. ABOVE ACTUATORS REPLACED AND ACFT RETURNED TO SERVICE. NO FURTHER EVENTS.