AL iMac marks on the LCD underneath the glass

For a few months I have noticed a sort of a stain in the upper left corner
of the screen.
At first I thought it had to do with the streak marks that I had
which were on the glass itself but inside. After inspecting this one more time
I found out that the marks (which are sort of brownish-burnt color)
are on the LCD and not the glass. Does anybody have this problem, and-or idea how to take care of it?

Take it in to an authorized service center.
There are no user accessible parts around the screen area.
My iMac G5 developed a tendency to develop moisture inside for whatever reason. It could be that when it was last put back together, there is something allowing moisture to condensate.

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