Dude I have the same issue. It's in the upper mid-left of my screen near the bezel. It is not any longer than the letterbox black bar at the top so it does not affect the image of a movie with a letterbox, but is about 2" wide horizontally so it is really noticeable.
I have pushed on the screen lightly in different places with a microfiber cloth and I notice that I can change the amount of bleeding in different areas of the screen depending on where I push. This tells me that the plastic cover (I have the non-glass version) is not secured properly or the tape at the edges of the panel which is supposed to block out the backlight from the edges is not secured properly.
Other than this issue the screen uniformity is pretty good and the colours are amazing. However, I don't have a warranty with this monitor as I bought it second hand and thus I am thinking about pulling the bezel off and seeing what I can do about the loose plastic covering with some extra tape sorta like this fix for the old Dell 20" screen:
http://www.tftcentral.co.uk/articles/dell2005_backlight_fix.htm
However, I haven't looked into how to pop the bezel off yet and will likely only attempt it after Christmas when I have extra time on my hands for a few days. The monitor isn't exactly put together that well but at least the panel itself is very nice...