clean your sunroof drains and the gaskets, should clear up the issue, I don't personally have the pano, but I have seen tons of posts irt the leaks and fixes.
I keep a fuelling log, basicly when and where I get diesel, how much etc, figure if my pump ever grenades I can show the dealer I'm a responsible tdi operator, or go after the station if they have contaminated fuel.
I second proper oil, also be aware the new rainx formula, (dark orange) seems to gum up the low wiper fluid sensor, easy enough to clean, but a pita non the less.
Get a vcds or make friends with someone who has one, they are imperative for quick and proper troubleshooting of any vw, by far the best 300 dollars I have spent on this car. If you don't mind getting your hands a little dirty the bentley manual is also a great investment for little more than a dinner for two. vcds will pay for itself in a couple uses, and you can modify many items in the coding as to how the vehicle behaves, how aggressive traction control is, hill hold, recode keys, tpms sensors, make your windows and sunroof open and close via key fob, many many tweaks.
If you do chose to have a dealer or indy shop do your maintenance you have the exact fault codes before you walk in, forcing the dealer to fix the problem with one part instead of 5 will pay for it in the first trip, plus when you post up a vcds scan the forum will be far more useful, likely there are 15 people who have been told by the dealer "Ive never seen this before" who now know exactly what part actually fixed it, and what the exact trouble code was.
its a great car, and fun to drive, enjoy it!