if you mean color spots size of a dime or so.
- easiest: it is dust in some step of the projection light path.
- hardest: the light engine could be damage
if you mean little ones as little dots (a neddle punshing) red and blue but always there:
- condition call it: pixels always on: light engine is the reason.
as you see the light engine is the main part here, IT is expensive repair. so if you can survive with those little dots do it.
IF it is dust, is good idea asking for and estimate to see if can works.
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