Problem with automatic trans w/tiptronic

I have a 2003 A6 Quattro 2.7T Automatic w/Tiptronic and my "Blue Bomber" has 135k on it. I am experiencing the transmission not shifting smoothly. It will stay in 2nd for too long when driven shortly after a cold start. When driving, when I need to accelerate, it does not shift smoothly as it once used to. Could my fluid be low or something? Any ideas before I take it in to Audi dealer?



Please be kind, I am very new to Audi and just bought this car in Feb 2014. Thank you.