Hi Gary,
Do you have a Xerox Maintenance Agreement? If so, this service could be covered and you should contact Xerox Support - contact info HERE.
If not, you can try contacting EFI directly for the part itself:
https://www.efi.com/products/fiery-servers-and-software/
Hello,
Fiery Tower model Server with J75 Press, Motherboard died (TYAN S5515), how we can get this replaced to a new one? Or where I can find someone who can help to repair this or help to get a new one?
Best Regards, Gary