The Automatic change regimin
No a tranny shop usually only changes the oil by a purge and refill method. Mine had 150K and still had factory seals on pan.
The filter was disgusting.
No there is not a way in car to drain the TC with the pan off. The method above drains all of the oil and replaces it, but with the pan off it is not doable.
Hpw much is the right amount for the refill if you do not empty the TC?