We have lots of these, and they still are running, filters out, bulb out, cover off, disconnect pcb and remove, light cover off, twin fans out, rear fan out, Blow and lightly brush down, Blow out fixed fan and optics area until NO dust comes out. 4 screws remove 4 screws and lift away filter plate, very lightly blow filters and wipe gently if needed use reflection of light to see if there is any dust on them! Remove lenses one at time - note which way round! - 3 nearer lcd block when removed, blow lcd screen and wipe if needed gently. Reassemble carefully, all good. We clean filters every 3-4 months and do an annual inspection of the clarity of the image, and clean as required.