Hi David,
is this a DLP type projector or one with a split lightpath going through a prism and 3 individual LCD panels .. one for each colour, red, green, blue.
I used to repair these things all day every day for another company and a common problem caused by overheating was damage to 1 or more of the LCD panels wich would result in green/red or blue colour tinge.
The overheating was normally caused by a unit well blocked up with dust in the filters and around the 3 LCD panels.
The only way to get rid of the colour tinge was to replace the faulty LCD panel.
What did you mean by ... "all the colors are off " ? offcentre ? as in out of alignment ?
Dave