Push the mirror body all the way forward (through the normal detent, till it folds forward...). Look up underneath the fat end of the lens (in what would be the gap...) and you should see a Torx screw, remove that screw. Now push just the mirror inner edge in on the inside end so you can see behind the mirror from the outside edge. There at what would be the top of the lens you'll see a metal clip that has to be compressed a little so you can drop the light lens down from the mirror body. Once the lens is free you can see where the light socket is and twist it to remove it. It's a 194 bulb. I replaced mine with LED's.
-Mike
Mirror folded all the way forward you'll see a screw like this... (stock screw is a Torx head screw...)
Push the mirror all the way in on the inner edge and you'll find this release clip... use a long screwdriver to compress it and pull down...