Bluetooth Keyboard - Some key don't work

Hi friends,

I have a 2011 (intel based) 27'' iMac with the bluetooth keyboard. I have two non working keys (control and 1).

There's a way to repair it? My iMac doesn't have warranty and I would like to repair it. What can I do??

Note: I remove the key and see everything fine, but still don't work.

Sorry for my bad english.

Kelvyn.-