The answer you received in your earlier post pretty much covered it -- there's not too much on a C22 that can go wrong other than the deck leaks mentioned in the prior response to your earlier post.
You could go to the Catalina 22 Association website and poke around
www.catalina22.org or .com
You could read this, which is way over the top for your boat:
http://forums.sbo.sailboatowners.com/showthread.php?t=102541
Much depends on the condition of the boat. Rarely will a guy with a rotten looking car have a pristine boat, so meet the seller in the parking lot.
We bought our C22 from a couple who had the boat, on the trailer, in their back yard. Lovely house, lovely boat. Every boat we've bought has been pristine.
You get the drift?