Hi Tony,

It is possible to replace individual micro switches on the button panel circuit board. As I mentioned earlier (as username WDM) while opening up the WK8 isn't very difficult, removing the circuit board from behind the front panel isn't all that easy. There are a lot of small parts that are held in by the circuit board that can easily fall out and become lost if one is not careful.
I would suggest contacting Generalmusic at (630) 766-8230 to find out the best route to take in getting your instrument repaired.

Dave