Casio CZ/ VZ/ FZ - Pro Series

Hi, I have a CASIO CZ-1000 and everything works perfect, but it has three or four keys really damaged. The recommendation from a repair shop was to change the complete "keyboard assembly" but they said is very difficult to get it and they gave me a price of $150.00 dlls aprox. which is the same price of some CZ-1000's listed on ebay!!...

So, I really want to repair my CZ-1000, do you guys know about a place where I can get this or if there can make the job of get the part and install it?

Thank you very much!.

Andres.