These instructions are written as if you were only replacing one fan, but you may want to do these steps to both fans at the same time.

The 2 screws supporting the fan are on the heat sink side of the bracket/shroud, so we remove the bracket first, so we can get to those screws next.

Remove four screws holding the bracket/shroud to the heat sink.

Tilt the bracket/shroud out. It may take a little more force than you would like. Thats OK. Try sliding it side-to-side as well.