I just wanted to take this opportunity to say that I've been really glad that a forum like this exists with people participating who are really knowledgable ! At times I've had some people go out of their way to even email me the pics / techniques to troubleshoot a problem. And sometimes these were situations where the local tech ( not a mercededes shop) couldn't even figure out the root cause of the problem. So in my opinion this is one great forum with really nice members.
Have a great day !