I am guessing that they will want to do the following:

-flush and replace fluids
-check hoses
-check tread on tires
-rotate tires
-test drive

Thats just a guess, and I'm sure there might be other areas they would like to check out. Most of those service mile check-ups I think are not worth the money. That is only if you keep up on your basic maitenence all the time.