Power supply burn to upper-left screen

You may never notice this unless you look for it and I'm wondering if it's happening to other iMacs. It's not perceptible with the monitor on. To see if yours has this issue, put the iMac to sleep and shine a flashlight at an angle in the upper left corner.
When I purchased my iMac in late 2007 it had a problem with an overheating power supply that would shutdown the computer. Took it to the Apple store where the repair tech, with the iMac turned off, spotted burns in the screen that radiated from the upper-left corner and spread out across the left side of the screen. He said that he had never seen this before and determined that it was due to the overheating power supply. My iMac was replaced with another.
A couple of months ago I noticed a small burn in the same location again. I'm wondering if anyone knows what the operating temperatures of the iMac should be. Here are the temperatures (in Fahrenheit) that I normally see on my iMac. Are these typical or are any running too high?
Ambient - 81
Power supply - 150
Airport card - 148
Hard drive - 121
CPU - 108
GPU - 135
GPU diode - 140
GPU heat sink - 135
Memory controller - 117
HD - 121
Optical drive - 108
FAN SPEEDS (rpm)
CPU - 1199
Optical - 998
Hard drive - 1219
Thanks!

I assumed that the temperatures were normal. My main concern was with the screen burn but I have solved the issue. The burn is to the coating on the glass screen and not actually in the monitor itself. The only problem is that no amount of cleaning can remove it.

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@flounder
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Power supply burn to upper-left screen

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