From what pics I saw it looked to me like they took the tranny out, put it on the bench upside down, then did all the work thru the hole the pan covers. It looked like a bank of solenoids in a casing that came out as a unit with some steel gaskets behind it. Im sure Ive simplified it but it didnt look like that tough of a job. Im thinking if someone already has a good working know how of Auto Transmissions they may know lots of tricks.
One guy I over heard him saying so many times hes just dropped the pan and pulled the little pin from the bottom and put it back in place, for our tranny it could be as easy as maybe replacing some O rings around the solenoids? But Im by no means an expert, Im just guessing or should I say hoping?