picopix max replacement part

picopix max work great over 3 yr now screen become dull and some dead spot I would like to know about the replacement part that I could buy from the market to change the dlp and led module ?

Can you explain what you exactly mean?
Dull is like the leds are dying, spots in the picture would be dust, if pixels are black or white, then they are stuck at on or off position and the complete optical unit must be replaced in either one or both cases. But that cost more than a new projector…
It is actually very bad for the environment. And i don’t think you used the unit 20000h…