Audi Owners

Recently(Friday night) purchased a alightly used(3900 miles) 2015 Audi Q5. We were able to take home the vehicle for the weekend, but was told we needed to bring it back for a final inspection on monday, which we did. Upon inspection we are now being told that there is a bad transmission seal and that they are going to have to replace the entire transmission. The transmission comes from germany and will take at least two weeks to repair. For any Audi owners out there does this sound normal to you? Also the car was not precertified when we purchased the it but did come with a 4 year 50K mile bumper to bumper warranty. There was an option for the 6 year 100k warranty but we passed on that. We still have time to have teh vehicle certified, would it be wise to now move forward and add that on? thanks.