what is a box mirror?

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I have an infocus X2 that has a problem with yellow discoloration along teh very rightmost edge of the image. I have been told to look at the box mirror to see if it is burned, but I don't really know what that is. Can someone give me some guidance?

Is a box mirror also known as something else?
Thanks,
-J
 
maybe...

Lots of commercial projectors use a dichroic beam splitter to seperate the white light into red, green, and blue beams. That looks like a cube made from two prisms glued together. It would have different colors looking from different sides.

Maybe that is what they meant by "box mirror".
 
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