Parts and labour for the V8 transmission can be extremely expensive. Experienced mechanics that can repair the transmission are very rare, at least in North America. Let's not forget that we are talking about a low volume luxury car and a first electronic Audi transmission. From personal experience, I would advice you to find a second hand transmission in working order and with low mileage. Removal of the old transmission and installation of the new(old) one would be cheaper. Good luck
Florin Man