digital keyboard parts

[trumpetsound]

I realize it will be difficult, if not impossible to locate what I need, but hey, that's what the Internet is good for!

I have a Williams Concerto (purchased in 2007) that has a damaged main logic board, and I'm looking for a replacement board.  

1.  Does anyone know where I might try to find this logic board?  

2.  Is there a keyboard parts warehouse or something like that?  Williams company has no more parts in their stock.  

3.  I am in the USA, and I have heard that there is a brand in the UK that has the same internal components as Williams keyboards?  Anyone to chime in on this?

Thank you for any help you can offer!