Hi tris101, welcome to the A2oc
Blistering paint is not a big problem on A2s but from the previous posts in this thread you can see which areas others have have had similar issues with.
I'd make an appointment to have the paintwork inspected then make sure the car is immaculate inside and out when you take it in - just to show its well cared for. Owning the car from new is a plus point and if it has a full Audi service history, even better, again these things show the car has been looked after. Be polite in all the discussions and try and get over that you are very happy with the car, apart from the blemishes on the paintwork. For me this always works better than moaning about previous problems. Its possible you may have to take it back for a second inspection by the Audi area rep - if so, make sure the car is clean again.
Hopefully other club members who have had paintwork done under warranty will offer additional advice
Cheers Spike