I think they're dead pixels. As I mentioned, they are at the extreme right of the screen, on the very last line.

I wonder if it's worth returning it. It's only noticeable because I noticed it initially (and if that isn't the stupidest thing you've ever read) but It doesn't bother me when I'm using the screen. Also, I don't want to return the screen, which is a sixty-mile round trip, and then bring home another screen that has a dead pixel dead center. That would drive me nuts.

As someone once wrote in a tech magazine, with millions of pixels on a screen (2,300,000 on this one), odds are there's going to be at least one that gives up the ghost. Honestly, I'm not sure if that's reasonble or not. In any case, I have another 28 days to return the screen. If I get another dead pixel anywhere else, I will certianly return it, but for now I'm very happy with it.