No. If water appears to be originating from a closet (almost unheard of) we would still enter the closet. We don't need to look in them for problems though in large part because they are rarely the source of problems like water leaks etc. If there's some water damage under the sink it would be a great idea to leave it open. That's very common, and probably already documented so we just want to keep reminding the owner with a quick photo.