Thanks for the assist. So maybe I'm confused here, but I was looking at my Audi Sound System Operating Instructions, and that's where the code had been written on the inside cover on a card that you're supposed to remove when you purchase the car. And of course it was removed and put into a safe place...never to be seen again. Anyway, what I do have is a sticker inside my "Maintenance" manual. Might that be the sticker you mention? And if so, how do read it? Btw, I did look in the trunk, but I didn't see anything.
Thanks again. I have the VIN sticker, so I'm still out of luck. I have a call in to the 800 number you gave me, so hopefully they'll be able to save me the trip to the Audi dealer. Not likely, but my fingers are crossed.