Light spots (not pixels, regions) on PowerBook displays

Be forewarned: This includes a lot of conjecture on my part.
We're developing some software and need to get some older PowerBooks for platform testing. We only need these things for a few weeks (OK, maybe months) and then would probably sell them once done with them.
In any case, we've seen a fair number of PowerBooks, particularly the 15" models, showing up on eBay with "light regions." I say "regions" because it really doesn't look like it's a typical failure related to electronics. When I've seen displays go bad they most often seem to show things like lines running up and down and/or across the display, pixels that won't change color, and blocked regions showing combinations of the two I've just mentioned.
These problems seem different in that they really look almost like someone came across the display and airbrushed it in a few places to make it look lighter or darker in the specific regions. The colors change on demand, but the areas showing spots are always show the same type of color shift. For example, if you turned the entire screen a solid medium blue, these areas would look like someone came along with an airbrush and sprayed the regions showing this light blue. If you turned the display red, then the areas would look like someone came along with an airbrush and painted them a lighter shade of red in the exact same areas.
What I'm guessing is that in the LCD assembly there's a diffusion sheet that was probably bonded to the back of the LCD panel so the light source would allow the LCD to appear to have even brightness when initially manufactured and displayed. My theory is that either through heat, abuse, or just time, that the diffusion sheet has begun separating from the back of these LCD panel by bubbling up, causing those areas to capture more light and hence cause these "lighter regions" to appear.
Here are my questions:
1. Does this theory hold any truth, or is it a bunch of hogwash?
2. If this theory does hold true, I would think that the diffusion sheet could be reattached unless there's a layer of glass over it. Has anyone tried this?
Thanks.

This should be covered under warranty, provided that it is not user caused.
Regards,
Jin Li
May this year, be the year of 'DO'!
I am a volunteer, and not a paid staff of Lenovo or Microsoft

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