Question about Mitsubishi WD-62725 62" Rear Projection HDTV-Ready Television

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Horiantal line near top of screen

The picture has developed a dark horizontal line few inches from the top of the screen. It is present on all input sources. Color varies slightly depending on background so I am assuming that it is blank. Any ideas on the cause and probable costs to fix? Thanks, James

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Suspect the Light Engine part # 939P977020.

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