DO NOT EVER USE franchise tranny shops.

It cost about $500 to overhaul the valve body. I don't think you need anything more than this. Do not drive car anymore. The only problem is they are gonna ask you to change the fluid too and will ask you to buy $30 a quart fluid... just tell them to reuse the fluid... it is "Lifetime." and don't budge unless the trans shop is willing to use cheaper compatible synthetic fluid.

Look up ZF website for local authorized trans shop.