L2251p Monitors / darker in Upper Left Quadrant

Just wanted to know if anyone else is having the following issue with these monitors.
We have at least 60 of these monitors that were purchased in june of 2010.
The last 3 weeks, we have had a a total of 8 exhibit the same issue and had to be replaced.  It appears the backlight in the upper left hand quadrant of the display flickers for a few moments and then darkens a few shades permanently.  Adjusting the brightness or contrast does not resolve the issue.
They're out of warranty but I'd like to know if we're dealing with a design issue so that I can go back to my bosses and tell them we're going to need another 10 grand in the budget to replace these things.

Well after weeks of anguish, trips to the apple store (not very professional ), calls to Apple support (no help), calls to HP support, they transfered me to airprint support who actually told me how to fix my problem. For an HP printer download from the app store HPAIO remote print. You have to search on AIO remote print. Installed this app and now I can make the print work like I would like. Good luck

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