In the technical manual of our site there is an excerpt on rust proofing. - Chassis and Body / rustproofing / body preservation
I put my car up on the hoist and went to each of the locations and thought if I was water where would I collect and "rust" until I could escape. Most of my water escaped through rust holes.
Check out the pre purchase inspection page in the technical manual as well : Main.TrailIndexPage | Buying a car | Prepurchase Evaluation
You cold probably cut and paste the list and make your own list very quickly to give to a mechanic.
Good luck.