Start by removing the trash bin from the robot.

Put it on its side, then pry off the black plastic cap from the wheels.

Once the cap is removed, remove the screw.

Then remove the wheels.

Remove the screws, then remove the plastic cover.

Remove the screw from the middle cog, then remove the cog.

Remove the screws holding the chassis together.

Flip it over and remove the wheels.

Then remove the side cover screws.

Remove the side cover and the middle cog.

Remove the 2 screws holding the chassis together.

Remove the screw holding the side cog in place.

Use some leverage to remove the cog. It usually gets stuck in place due to limescale buildup.

Flip it on its back.

Use 2x 7mm wrenches to loosen the bolts on the rod going through the front brushes.

Remove the rod.

On the side that you removed the other cog, remove the now removable cog.

Remove the brushes by tilting them up on one side, then pulling them off.

Remove the 2 screws that were covered by the brushes.

Remove the top half of the chassis.

Under the box, of course.

Use a 7mm wrench (or other tool) to remove this nut from the cog.

Then remove the plastic circle thing, as it covers it and prevents you from removing the cog.

Then remove the cog.

Remove the plastic circle and tab.

Remove all of the marked screws.

Pull on the 2 rods to remove the assembly from the chassis.

Unscrew all of the screws in the assembly, and voila!

It's open.