Black band on my 30 inch cinema display. Any known causes?

Hey everyone,
My 30 inch cinema display is doing some wierd things which I havent encountered before.
If you can see the image, towards the LEFT SIDE CENTRE, there are these BLACK BANDS.
these start to appear after about 5-15 mins after the display is turned on. although they dont show up on bright backgrounds.
If I let to monitor cool down for 10 mins and start it up again they are gone and they start appearing again in about a min or two,
Has anyone seen any such issues before or is this a known issue with the 30 inch.
Any ideas on what I should do about this.
I will be taking it to Apple for sure as its still under warranty but would like to know
what is causing this and whats apples take on it.
Cheers,
Ani

I bought a 30inch as well a couple of months ago but have very little use except for watching movies. But when I use grey colour as the background the banding mark became very noticeable. It seems to be some kind of design issue i suppose and I dont know how Apple is going to address this. It's not a cheap monitor after all and i am very disappointed with this.

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