Owners manual for 60 inch mitsubishi 1080p dlp hdtv miscro dispay

SOURCE: Mitsubishi WD-52525 52-inch DLP HDTV ywllow warning lamp light

that means your lamp it is getting to the end of its life.
sometimes even if the lamp still good the TV will send you that message because that timer is closed to 5000 hours

What you can do is open the lamp door, closed again and the tv will ask you if you replaced it the lamp, and just say yes and that sign will go away

or just simple replace the lamp. 915P020010

SOURCE: How do I reset lamp timer on Mitsubishi DLP TV?

I cant find the solution to reset my lamp hours, I replaced it, unplugged the tv like i was supposed to to. Its not reset. I have a 73" 1080p ...wd 73831 series

SOURCE: mitsubishi & 1080p logo floating across screen

did you ever find the solution? Im having the same issue!

SOURCE: Mitsubishi 1080p 73'' DLP HDTV - Color distortion

This would be the little sensor on the light wheel. Its cheap, you can get them online for around $2. You will need to take the light engine out and remove the color wheel cover and remove the color wheel and then remove the sensor. You will have to desolder the sensor and remove it to replace with the new one.
What is happening is the sensor is overheating and not tracking the color wheel properly there for the colors get messed up. Once you replace the sensor the tv should work like normal. The part is
(Sharp GP2S40 Photointerrupter). It is very difficult to find because they are not made anymore. Most major online part stores do not carry them but I found a lot of them at Wright Hobbies. Good luck.