IMac Aluminum 24" with yellow horizontal blotches

We have an out of warranty iMac 24" with yellow/dark horizontal blotches on the screen. The closest I can describe is that they look like residue from someone smoking around the iMac and the internal air currents have deposited the smoke/tar onto the inside of the screen.
But since we do not smoke this isn't the case.
Is this a similar ongoing issue that I read about the 27" in that it is the screen and not some sort of haze forming on the inside of the glass panel?
Has Apple acknowledged this as a problem and issued an extended warranty or recall or is this down to the old 'squeeky wheel gets the grease scenario"?
It is most obvious with a bright white background but less so once you have a darker pattern up. Still makes me think it will throw off any colour correction being done and since we're talking prepress work....
Thanks
Kevin

This is sounding similar to what i am now experiencing. Bought the Mac in early Sept, this started yesterday (Nov 17th), after "waking up" my computer from sleep mode out of no where. I have a 27in iMac, noticed - what I thought were smudges or dirt in the upper right portion of the screen. It's not, right now as I am typing on the white page I see slightly light yellowish spots, blotches, one looks like a 1/2 inch "drip" pattern.
Appears it's apparently spreading as well, the upper middle, and upper left I am noticing it now as well. Yet the center and bottom of my display is fine..so far.
This is not the first post about this issue here, so there is an obvious flaw.
I bought the AppleCare, "One on One"..so I suppose I will try to get in touch with them Friday. What upsets me is this is my FIRST Mac..dealing with Windows since March 1994 until I simply had it with them. Never once had screen burns or issues with monitors.
I love this Mac, but darn this is not the great 1st impression.

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