Hey all, 
It's been a while.  I have 2 HHKB Pro 2's which are having some serious USB issues.  They're dropping all the time, not to mention the fact that their filthy.  I took one out of rotation entirely because it was so bad (USB problem, not the filth).
I was wondering if there are any reputable vendors who I could send these to to clean them up and fix the USB issues.  If I need to buy a new controller board that's fine (I replaced the controller on my black HHKB with Hasu's wireless board).
Could anyone steer me in the right direction for this?
Thanks all!