I found references to telnet, ssh, and "serial console" in the following post. I know what telnet is because of my days working with some of the old versions of MS DOS and Linux, but I don't know what ssh or serial console mean. In the DIAGS menu, referred to above, if you hit the number for "change serial number" it goes away and waits to be changed via the "serial console." If I could use that, I could change the serial number of the replacement motherboard and be able to register it. That's what I'm aiming for.