Would replacing the camshaft and crank shaft oil seals require opening up the valve cover? What about running intake engine cleaner like I mentioned before. Would that require them removing anything that a bolt could slip through, I/C piping, etc.?

I wondering if I could gather enough evidence to pin them down. I also still have the copy of the service record where I brought my car in when the engine was "revving up" on it's own, which the service department was supposedly "unable to replicate" again.