First, after being in, on and around this forum for some time, it has become apparent that technical/engineering/mechanical skills of forum members varies greatly. That said, after having my cars to many, many different indy shops, I've come to realize that the same concept holds for both indy and dealership mechanics/techs. Read the following thread carefully, notice how the dealership was close to solving his "no start" problem but in the end, it was a friend with encyclopedic knowledge of the W210 that saved the day.

Perhaps his friend could offer consulting services to the dealership on an hourly rate, no?

http://www.peachparts.com/shopforum/tech-help/351289-w210-dies-freeway-cranks-no-start-2.html