at 15k miles, id just do oil/oil filter change, cabin filter change. all else is visual inspection.
i suppose if you want to check your intake air filter you can. it's only 2 clips to pull up the filter per side...unlike my G where it tests my hand acrobatics and patience.
well, until i got my stillen intake on there.
f- i hate dealers. i dont think i spent more than 200 on my Z's maintenance the last 5yrs total.