What was found
AT 43000' THERE WAS A PRONOUNCED DUTCH ROLLING. ALSO YOKE KEPT GOING LEFT - RIGHT. DESCENDED TO 38000, STILL ROLLING. DESCENDED TO 31000, STILL OCCURRING. THRU 33000 YAW & ROLL PRONOUNCED. DIDN'T SETTLE UNTIL MID-TEENS. WHEN YOU HIT ANY TURBULENCE IT WOULD START AGAIN. TROUBLE SHOT & FOUND ISSUE WITH RUDDER POSITION RVDT. R & R RVDT, FOUND BAD. ORDERED ANOTHER RVDT. REMOVED RUDDER POSITION RVDT. REPLACED WITH REPAIRED RUDDER POSITION RVDT IAW AMM 27-21-09 REV 7. OPERATIONS OK.