First of all you will never get to Mercedes Corporate, go the dealer route, the "MB zone route", MBNA supports their field personell. They have the ability to re emburse the dealer for any work. I would get a written estimate from an MB dealer.You could probably hire an attorney and serve MB, and the first question is weather you tried to have the problem solved in the field. MBNA hires teutonic females at corporate the executive level. They will bounce your letter back to the field for information and the zone guy (who will have no clue) has to respond.