I bought 5020UB projector in December of 2012. It is great 3D and 2D projector. I installed it in media room projecting on 120" screen. Around a month back, I saw a red patch visible when a scene is pitch black. Cleaning the lens cover etc didn't fix the problem. Nor the steps that Epson support asked me to perform helped either.
The red dot is not seen when projecting the blue pattern image. It can be seen only when it is dark/black picture. I connected a laptop directly and used MS paint application to draw a black rectangle that covers the area where this red dot (around 1 in in diameter). I can see it clearly. Then I used a white napkin and moved it closely to the lens (me standing right below the projector). I moved it to the area where the red dot is seen. I can see a small mesh of red lines on white napkin when it is covering the area in question.
Is it a known issue?