Howdy and welcome. The dark chrome window trim is warrantied to the original owner for 36K months. I think you're going to have fix it yourself. My first spots only appeared the morning after my 36 months (just kidding, but it really was shortly after the 36 months mark). I had been watching for any first signs of spotting. My solution was to get on it right away with rubbing compound (by hand), then polishing compound: but crap, the spots did indeed go away, and the area I had rubbed/polished was now brighter than the rest of the dark chrome finish. So, I went over all six pieces to even the finish and then put three coats of wax. So far, so good: I have one lighter patch at the rear end of the piece over the driver's door: not enough of a flaw to get me to tackle it again. And so far, no more spots appearing.
When I priced new pieces last summer, they totaled (with tax) $579.19. I haven't bothered to see how much a body shop would charge to paint them piano (gloss) black to match the pieces of trim that are that color on all Stingers: most noticeably the two that run parallel to the dark chrome on the sides of the windshield: I think that is the best way to go if you are not going to rub the spots out and wax/ceramic coat them, or replace them.