It's likely safe in terms of pathogens because of the acidity and refrigeration. Probably flat, and oxidation can do weird things to flavors.
Nah I didn't leave it in there for 17 years, the company brought it back after 17 years, I got it at the supermarket today and I was like...
Actually.....it's a little bit lighter (hopefully!) than Pepsi.... BLUE. It's a wavelength thing..... Why the Water in a Nuclear Reactor Glows Blue