PS: The spot is not green, that's the wall color. It's basically just faded. Also, that lighter blue spot on the right must just be my poor photography skills.
Edited by lpeters82 - 7/1/12 at 8:22pm
My GT720 did the same thing. Took it apart and found the lenses had melted. The big lens was black through the middle and the others were cloudy. The mirror was also cloudy. I have ordered a replacement from eBay. A used part that includes the lenses, light tunnel, and mirror. I'm going to just swap my good parts over to the new one. I've read that aftermarket bulbs can cause the lenses(made out of plastic, by the way) to melt. It's apparently a known issue.