Welcome Arve,
There are a few Washburn owners here that might be able to provide some insight. However, you should also try the Washburn forum (washburn.com). See if you can locate a guy going by the name Pike. He sometimes has leads on the older models. I'm not sure who else is over there, but if they can help, they will speak up.
If you plan on sticking around, stop at the fret players section of this forum and do a formal hello.