I currently have a KCM831 giving us some problems. We arrived on site and found 2 lon boards on top of the controller. We put them back and they appeared fine. We did a LON setup and nothing. So we bought 2 new boards, relearned the shaft as we swapped one board at a time with the new one. Still no communication. Car cant run on inspection and we now find new faults 0177-78 0181,0182,0187,88,89 Brake board have voltage going into it but not picking up. Brake switch contacts are good. Does the processor send the signal with the run command? What might cause this to occur ? Any thoughts or advice is greatly appreciated thanks!