Hello, recently my z-zero plate stopped working. When I measured the voltage at the PC power supply connector to the PRT board, it is showing 5v on 1st pin, then 2 grounds and 12v on forth pin. However the pin 1 that the z-zero plate is connected to, on the main board, is only showing 1.1v. So my e-stop and my z-zero are not working. Any one ever had this happen? If there any surface mounted fuses or other components that I can check? Thanks!