Well, I don't know where you're located, but in North America, there's only ONE service location for legacy E-mu hardware... in Tampa, Florida.
http://www.eprelectronics.com/
No way to know if they have the parts, as they don' t actually list any parts on the site. You'd have to e-mail them and ask.
In Europe... well, you'd probably have to contact E-mu Europe and ask them if there are any service locations left.