There are clips on each side of the mirror and two small torx screws in there. The screws are easy to cross thread (metal to plastic) and if the clips aren't lined up perfectly it will create a gap. I've taken mine off twice now due to a warranty replacement. It's not a difficult job but you need to take your time moving the mirror around and carefully using a small torx driver and clip removal tool and try to not scratch or put too much pressure on the mirror. The screws are behind the mirror.
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