Hope this helps someone , I own a 2020 Niesmann Bischoff Arto 88LF recently the control panel failed to power up , everything pointed the control panel, Spoke to Travelworld they said bring it in we charge £140 per hr and a new control panel is £749 great , Tried apple jack the said they was unable to repair due to not receiving software updates from CBE or Travelworld ?? great. then after research found this chap Electronics Alfreton (John )01773836485 sent him the panel repaired it £120 all working fine , hope this is help for anyone else with electrical problems.