Flip dock upside down and remove rubber feet

Remove bottom plate screws and remove bottom plate

Remove the mainboard and its three screws

Make sure to unplug the fan on the other side as it is still connected to the chassis, it may need some persuasion as the connector is really in there

Pry the top plate away from the main chassis, this may take some persuasion as the top plate is glued in a bit

When the screws are out the fan should just fall out

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sample text, the photos speak for themselves

Insert wisdom here. - indeed

Support the heatsink and line it up with the holes on the top of the chassis

Line up the fan with the holes

Line up the top lid with the main chassis, make sure to have the fan vent in the correct orientation so it can breathe.

Secure the mainboard with the 3 TORX TR8 screws. - no you arent missing any the rest of the screws go through the bottom cover

Re-install the rubber feet, you might want to put a bit of glue on these to keep them on when moving around