In a restaurant is a steak a la Andy Griffith (famous for A1 and steak). At Mercedes an oil and filter change, a CPU service reset, a check of the tire pressure (5 tires), plus a visual of everything in the car from brakes to sun shades, as detailed on the owner's manual. You can do it yourself or at a shop, keeping a record of what you did and receipts of "approved" materials used.
Considering the low mileage, you may wish to publish the car and turn it in if you could not sell it before the deadline. You might be able to sell it for your balance plus a reasonable profit.