Motif 6 dead keys

[7 Lakes]

Yesterday I purchased a Motif 6. Unfortunately, in one of my stupid moments, I didn't play every note on the keyboard.
Three are dead and a couple are intermittent. I have searched without luck for the answer to this question. Are dead keys an expensive repair? I paid $525 for it and the owner stated clearly that everything was in working order and like an idiot I believed him. Any advice?

 

[DickR]

I am not sure the motif has the same system as most Yamaha keyboards. But if it has, I believe (it sounds like) one of the underlaying rubber contactpads needs to be replaced. Typical for this malfunction is, keys give no sound, to loud or to soft, key gives a half tone up or down sound or even a double tone.

 

[delaware dave]

Try this:

http://usa.yamaha.com/support/contact/pac/