I have a Toshiba 53ax61 Cinama Series 53" Projection T.V. It is about 4 yrs. old and has been well taken care of,[ no abuse ]. It has developed a yellowish spot about 3" round in approx. the middle of the screen. I see it mostly when the screen is lihgt or white. I live in a 100 yr. house that is quite dusty at times. Could this be dust on the guns or mirrors ? If so is it a big issue to clean them, and what should I use to clean them with ? I thank you very much if you could help me with this problem. P.S. I've had the lower front off and could not see or get to anything.

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