Funny you would know that?Funny - to me this sounds like a typical dealership's response.
I've done my own work on my vehicles since high school and will continue to do so.
As far as I am aware most all dealership do not do a full fluid replacement? And very few Factory Service Manual outline the procedure. Hence the Lifetime Fluid and not service Transmission that seem to have come into the industry since around 2000"s?
And doing a service since you were in Highschool never means you ever did it right. LOL