If you are not already a member...
Go to Catalinayachts.com. Contact the head of the Cat 30 and see if you can get some old 30 write-ups. Mainsheet (their publication) is a great resource which may or may not have all of your fixes. Surely they keep copies of their techinical printouts???
As far as tracking down your leaks, get a friend to stand down below and spray specific areas with a waterhose. Could be the stanchions or chainplates leaking or the windows. Pretty common. I would not doubt there is a good possibility that they need to be resealed.
You can be assured, that whereever you THINK the leak is coming from, it is coming from somewhwere completely different. It is really wierd how water magically travels inside a boat and finds its way in.