If you've been lurking, you'll know that the best resource is the search button! But to quickly answer some of your questions...

1. DRC = dynamic ride control, Audi's hydraulic shock/suspension system which keeps the car from rolling as you make a turn but something is structurally wrong with it and the system often fails (easiest way to tell is to check the shock for leaks.)

2. Warm weather package is the replacement of the sun-roof with a solar-paneled moon-roof which will run the air circulation system to help keep your car cool(er). Contrary to popular belief, it's not the actual air-conditioning system that runs but rather just the fans to help re-circ. the air. Cheers and welcome.