I have a unit here that is coding 319 at startup. Parts swapping ensued, best I can do is not have it code immediately, but intermittently get stuck needing left and right pedal cycle, immediately code 745, or have no code, but upon acceleration, will feel the shift to the right side and struggle to move until a turn to the right moves it normally. Swapped handle, tiller box, acc3, acc2, acc7, acc1, brake switch, whole harness from a working unit. Software update. Verified acc3 cables and drive motor cables are right. Distribution board with fuses And relays. Brake coils. Help?