Flip the projector over and turn around so that the lens faces you.
Twist the gray zoom adjustment ring clockwise and extend the lens all the way out, and then slide the zoom adjustment ring all the way towards the end of the lens as far as it will go.
Slide the front case plate towards the loosened zoom adjustment ring, until the top plate of the projector is freed from underneath the lip of the front case plate.
The front case plate will not come all the way off due to the zoom adjustment ring obstructing it. It will merely slide forward a bit.
Use the needle nose pliers to pull out the grommets securing the main fan to its housing.
To replace grommets, pull the center pins from their housing, and slip the exteriors of the grommets back into their holes in the fan housing, then push the centers in to secure them in place.