2014 Rogue pulls to right after 2nd tire rotation (10k miles

[wope]

I purchased a new '14 SV back in July. At 5k miles, I had the first oil change/tire rotation done. No problems. At 10k miles, I had the second oil change/tire rotation done. Immediately after this, I noticed that the car now pulls (noticeably, but not severely) to the right, particularly when accelerating. Thinking it may have been a coincidental alignment problem, I un-did the 10k rotation (put the tires back to where they were prior to rotation), and the pulling was gone. Thinking maybe my dealer did not put them back on correctly, I re-rotated them, and the pulling is still there.

To summarize:
-Dealer rotated tires, immediately noticed pulling to the right
-I switched tires back to pre-rotation, pulling gone
-I switched tires back to post-rotation, pulling returns

I plan on bringing this to the dealer on Monday, but I'm not sure what to expect from them. Does this sound like a tire issue? The 2 tires (that now pull) are the two that were originally on the front of the car when new, and it did not pull then. Could there be an alignment issue in the rear that would cause this to mess up the tires while they were back there for 5k miles? Like I said, there is no pulling on the other 2 tires. I've inspected all 4 tires, and did not notice any uneven wear, lumps, or anything like that - however, I'm no tire expert.

So I guess what I'm asking is... what does this appear to be? What should I expect my dealer to do? I know that tires are specifically excluded from the Nissan warranty, but that there is a manufacturer's warranty. Should I expect them to replace both tires in this set? or all 4? Should the dealer offer to check the alignment for free?

My rogue came with the Hankook Dynapro HT 225/65/17 tires, by the way.

Thanks in advance for any comments.

[ImStricken06]

low tire pressures will cause a car to pull.

check the tire depth on all 4 tires. lower thread depths will also cause pulling.

[wope]

low tire pressures will cause a car to pull.

check the tire depth on all 4 tires. lower thread depths will also cause pulling.

Sorry, I forgot to mention in my original post that I did check tire pressure and ensured it was even (33psi) all around. I've also measured thread depths on all 4 tires, and it is consistently ~9/32.