Disklavier

I have a new DC2 and have been playing it w/o a problem until today.  
After switching to Silent mode (something I have done several time 
w/o a problem) all keys now feel like they are difficult to depress.  
I have switched back and forth between silent and not, but the 
problem still exists.

Recorded music barely moves the keys also.  I did notice that if I 
depress 1 key and hold it, any other key feels correct.

Anyone have suggestions on correcting this?  Does anyone know how to 
run the Diagnostics?


Thanks,
Keith