I had a unit on a Sprinter chassis. I used Western Star for service work. They have many locations throughout the country and take care of Freightliner and Sprinter units. I once went to a Mercedes dealer for an oil change and western Star was 1/4 the price and they do big rig quality work.
Google them. I am sure there is one in your area. They do Sprinter warranty work too.
Phil
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