I haven't had the opportunity to pull the pan back off just yet. I found a rear billet servo from Performance Automotive and Transmission Center at $19. Is there anything else needed in order to swap pistons?
Just a C-clamp and large socket to compress it a little so you can get the snap ring out. First I'd air pressure test it though to make sure it's the problem. Throwing parts at it in hopes of a repair isn't the proper way to do things. Also about that El-cheapo billet servo, if you do have to use it make absolutely certain that it fits good and tight. The cheap ones I've seen are sometimes made too small and can flip in the bore easier than a stock one.