the pics on this post are very good,,on what to expect when taking apart,,other than usually the springs are broken!!!... Usually just replacing the springs,scuffing the bores with scotch-brite,,,replace the rubber piston seals,,,,....should work like a million bucks!!!!
There is no down-side to this repair,,,you are only bringing the servos back to factory spec
There are other issues with the valve body,,,but are more related to rebuilding the trans due to the fact the VB is not too acessable without the trans out of the car
gbaum