[disad-vantage-d]

I have a 2011 E350 CDI which is indicating service A due.
Can anyone give me an indication of cost for this service?
I have also been told that the vehicle may be due an automatic transmission fluid change being three years old. This contradicts a thread I have read on here which says 4yrs or 37,500 miles.
My car has covered 17k. Also, an indication of cost for this? Thanks...