Discolored Display/not image persistence or burn in

I have a late 2007 Intel iMac. I had this problem once before already and Apple replaced the display. I see that it has happened again. There is a random amount of grey discoloration happening on the left side of the screen. Not evident with a white background, but quite evident with a grey background. It does not appear to be burn in or image persistence. I wonder if the small halogen desk lamp I have on the left side (some 8" from the edge of the computer) could be responsible? Anyone offer an explanation for this?
I do have AppleCare and can take it in. I'm assuming I can't fix it myself.

I do NOT have a halogen lamp next to my iMac 7,1.
I do have 2 small Bose computer speakers on either side.
I have horizontal discolorations on the left side similar to yours.
LCDscrub http://toastycode.com/lcdscrub/ might fix it, but you will have to buy the software as the trial version is really useless (for obvious reasons).
I am living with the problem until next Summer (AppleCare expires in August 2010) when I will take into Apple for a fix.

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