Not sure about that particular box but friends with 6 and 7 series BMW's tend to take there cars to the ZF workshop in Glasgow. Where they do either a fluid change or in higher mileage cars say over 100k they do a valve block change out on the ZF auto box.
There are lots of earthmoving equipment with ZF autoboxes and that manufactures workshop is kept busy.
In reality most Aero's will never get to these mileages.
