I doubt the dealer will sanitize unless you pay for it, really is a simple process there are many threads covering that topic.
Forum library has a PDI check list so print out a couple of copies one for each of you and then cross check.
If you want record the PDI because there is much to remember.
Have the tech show you how to dewinterize and make sure you are shown how the valves need to be turned.
Take a bag of pop corn to test the microwave.
Heater and A/C demo.
Make them show you how to do it.
Anyway I do welcome you to the site and good luck with your PDI and new unit.