Flip the unit over so the power cable is facing you.

Remove the two screws from the underside and two from the top side - 4x20mm PH2 + Washer

Remove the 2x10mm PH3 screws from the middle

Remove the 6x20mm PH2 screws from the holes. These are moderately deep and may be filled with dust/debris/wasp nests - you may need to clear them out a bit first (but they're not as bad as the ones in Step 1!)

Remove the cover, but note there will be a wire from the power plug still attached.