Ok, found this after a search. I think it covers it. Thanks.
... the glass has to be removed to access the motor and cover. Position the mirror glass to the full upward and inward position. This will allow' access to four clips under the glass that can be released with a screwdriver blade. (It is recommended that you place a shop towel between the mirror glass and your hands in case of breakage.) Facing the mirror glass, the clips are about 2, 4, 8 & 10 o'clock. Start at the lower outboard tab and continue around the mirror until all four tabs are released. Once the mirror glass is off, you will be able to access 4 exterior mirror cover retaining tabs from the inside top of the mirror assembly. BOOM, the cover is off.
P.S. DO NOT BREAK THE GLASS! You'll wish you had taken it to the dealer, because it'll be about a $350.00 mistake."