2016 auto trans service

Couldnt find anything already existing about this...
I called my dealer and told them i want a trans service, so they went through the typical "WS never needs replacing dance" and so on. Anyway, they said they can only do a "fluid exchange" and that there is no filter to service or replace. The price was $275. Has anyone exchanged their own fluid yet? I have a case of schaeffers ATF, but the dealer wont put it in the truck because it is not a toyota product, and im not willing to let an indy shop mess with this trans after it took toyota so long just to figure out how to top it off. I did get an extended warranty because of the low atf condition, so im a little apprehensive to put anything but the toyota WS in it, but from everything Ive read that stuff is complete garbage.