Disconnect the rotary position sensor cable.

Remove 2 small screws and remove the black plastic piece.

Remove 3 screws and lift them out of their rubber grommets.

Holding it by the ribbon cable, rotate the bare colour wheel through 90 degrees in order to remove it.

No further disassembly is feasible, and the bearing is not accessible for lubrication. Flicking the edge with a finger, the wheel should spin completely freely.