Liquid Spill in an iMac Al Keyboard repair?

I have a 20" iMac with the Aluminum KB. I recently had a coffee spill in it and now the Z through B keys and left Command Key and the Space Bar do not work.

I have removed the key tops and tried some alcohol in it, but with no luck. Is there a way to get further into the KB to access and clean the other components? I love this KB, it's the best of any computer KB I have ever had. A new one, here is Brazil is not only expensive to buy but could take months to get.