What was found
(CAN) PILOT REPORTED LATERAL CYCLIC IMPULSES FELT IN ALL FLIGHT REGIMES WITH AUTO PILOT SELECTED ON ONLY. EXTENSIVE TROUBLESHOOTING WAS CARRIED OUT OVER A 3 WEEK PERIOD. THE FINAL RECERTIFICATION OF THE PROBLEM WAS THE REPLACEMENT OF WIRE C943D22, WHICH WAS FOUND CHAFING ON THE ACFT STRUCTURE UNDER THE INSTRUMENT PANEL ON THE LT SIDE. THE WIRE THAT WAS REPLACED WAS FOUND IN WIRE BUNDLE K-TJ3-4B, WHICH WAS PART OF THE EFIS MODIFICATION. A TEST FLIGHT WAS CARRIED OUT SERVICABLE AND THE ACFT WAS RETURNED TO SERVICE.