has anyone had problems with the electric steering ratcheting upon stepping on deadman peddle. upon steering auto-centering the steering unit will just ratch back & forth instead of coming to a location stop as normal , steering controller , proxy,encoder,interface card,carriage card has been replaced inspected steering motor pinion gear reduction all hardware is intack C5 code will come up not all times. have performed steer learn , after learn has been completed and display reads done the steering drive unit starts to ratchet.all tests are by the book