What was found
ACFT WAS GROUNDED AS A RESULT OF THIS EVENT. 5 UNCOMMANDED RUDDER MOVEMENT DURING FLIGHT. FIRST 2 INITIALLY THOUGHT TO BE WX/WIND RELATED. LAST 3 HAPPENED DURING FINAL APPROACH WITH AP ON AND OFF. 4 WERE LEFT MOVEMENT, 1 WAS RIGHT MOVEMENT. FIRST ONE HAPPENED 5 MINS AFTER T/O. SECOND ONE HAPPENED 5 MINUTES AFTER T/O LONGER IN DURATION. 3RD ONE IN INITIAL DESCENT AND 4TH ONE 30 SECONDS AFTER INTO OPPOSITE DIRECTION (RIGHT TURN). 5TH ONE HAPPENED WITH AP OFF INTO FINAL TURN (LEFT TURN).