Remove power board from hood and flip over

Remove bolt from heat sink. Note that there is a nut under the heat sink, so you will need to hold the nut with your finger while unscrewing the bolt.

Use knife to separate adhesive from heat sink. There is white adhesive under the heat sink that will hold it in place. Being careful not to cut anything else, slide a knife between the heat sink and the adhesive to separate the two. You may need to do this on all sides of the heat sink. There is no need to remove the adhesive.