The only section that is 404 is the home training school, and I can't speak for that. I only found that one 404, and that could be a server issue, not a webmaster one.
I have a DSL connection at 256k, so maybe you are getting 404s at a slower speed connection. I can't say. What I can say is that the ASHI certification says that your inspector has at least been exposed to proper and ethical inspection techniques. Whether he uses them is something else altogether, and not anything I would necessarily hold ASHI responsible for.