The mirror housing is secured using 2 T20 Torx bits.

Pull upwards and outwards to remove the cover.
You will feel force against this, as it is held in place with 2 plastic tabs under the cover, you could lever the cover up at the bottom edges, but to avoid marking the interior plastic we advise against this.

As you look down the cover you can see the adjuster mechanism secured into the cover with a single clip, gently lift this clip to release the adjuster.

With the cover removed, you can now access another single T20 retaining screw for the seal.

There are 3 more T20 screws holding the mirror firmly onto the frame

Carefully feed the adjuster through the hole in the frame and the mirror should now be free.