30" uneven brightness, shows as a dark band

Hi everyone,
I had a perfect 30" Cinema Display. Lately it started to show a dark horizontal band which starts at the middle left and extends to nearly 75% of the display's width. It's clearly the backlight which is causing this and after a while of use it normally gets a little brighter and therefore less noticable. This behaviour started only a few days ago and before that the backlight was relatively even.
Since it's only a few months old, it's still under warranty, but I know that the whole display will get exchanged for another (often not really "new") one. Mine has not a single dead or stuck pixel and I fear that if I take it to an Apple Dealer to get it exchanged, I might get one with even backlight but maybe dead pixels.
Is there any way to make sure to only get a replacement which has no dead pixels? Mine has none and I do not want to get a replacement that's not as good just because of my backlight issue...
Any help or ideas are appreciated!
Thanks
Björn
PowerBook G4 Mac OS X (10.4.3) 30" ACD

I have exactly this same problem.
I purchased ACD 30" from Apple.com (online) early December 2005. Only one dead pixel and backlighting was very even and no dancing green pixels. I use it with a PC (using the ATI Radeon 9600 Pro PC & Mac Edition).
Then, suddenly about a week ago, a dark area developed. It starts on the left of the screen, is about 3 inches tall, and then extends to the right a little over half the screen, gradually tapering off.
It's a fuzzy, darkish area, ie not with hard boundaries, but very noticeable (most of my windows have white backgrounds). It just looks like the area is dirty (yes I've tried washing it!).
The area starts quite dark and then gets somewhat lighter the longer the display is on, but never goes away, not even close.
I run the display at minimum brightness (I work in the dark!), but even when I turn it up to max brightness, the area gets brighter, but is still dimmer than the rest of the display (which is otherwise very even).
Is this just that the backlight has a certain area that's dim or partially burned out? Are there multiple backlights on this display? Or a single one (w/ spreaders) running along the left edge maybe?

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