Hello, We own one of the first 70D. As we live in a cold and snowy area we asked we were pleased to learn that the new S came standard with power heated side mirrors. It is a security feature many month of the year here. Ours did not arrive with the power side mirror so it was retrofitted. If some of you had the power side retrofit, could you tell me if the heating of the mirrors is working for you? The retrofit has been done on our car mainly for the defrost / heating part and it is not working now. Another issue is the electrochromic option. I was thinking it was part of the power mirror but it does not seems to work either. Thank for your sharing your mirror retrofit experience!