you will have to remove the tweeter housing, two screws behind the door latch, and one screw under the small rubber mat on the grab handle to get the door panel off.
Details and photos on earlier post, how to remove and replace folding miror
thanks but I got some warm/hot water and poured it over the mirrors arm where it connects to the car and it seemed to do the trick. The mechanism was obviously frozen... as the button suddenly sprung into life. I should have just done this in the first place but I was half asleep and didn't think of it at the time doh..
This happened to be the other day, in my case it was the switch frozen not the mechanism as I can defo remember it getting snowed on which melted and then refroze. Switch almost fells like there's nothing behind it, started working again when the car warmed up and has been OK since