low miles 2004 E500 Wagon; I look forward to a labor of love here but would really like to get a diagnostic run even before I take it in for repairs. I am happy to pay for the assistance and don't object to going to a smaller shop. Had hoped to make some progress on this by now and thought I would make a couple of posts to see if anyone would be interested in helping before I "throw in the towel" and turn it over to professional assistance.