We have an ap1000f, serial ac400179 that the steering cylinder shakes back and forth with no input from the steering wheel?? Steering sensor is calibrated and reading correctly, and there are no fault or event codes. Several of our f model pavers do this, but this one is quite violent and is causing problems with the quality of the mat. Our cat dealer is looking into a svc bulletin for a pin in the column but not sure if that will help. Had anyone else had this issue??