D80 woes

I first noticed these marks on my new D80 several weeks back after I uploaded the photos to my laptop. After multiple attempts at cleaning the lens and not not able to see any marks on them, I was under the impression that I have got over the problem before my trip to Paris last weekend.

To my horror, I just noticed them same marks again on the same spots after copying the files to my computer. It really seems weird as I can't see any 

dirt/scratches on the lens with my naked eye, but I guess I will have to bring it to a Nikon specialist to find out what is wrong. 

I hope the repairs will be covered under the warranty since I have bought it for only 2 months!

Update 18 Dec:

Well, it seems like the issue was caused by dirt/hair particles in my sensor, which I confirmed after bringing my kit down to Fixation to check. Did a few shots when I was over in Istanbul but have yet to sort through my pictures in detail, but initial checks seems OK.