How do I do this? Both my mirrors will only go left and up, so I guess it's a switch problem rather than motor. I bought a unit on eBay, but don't know how to take the old one out. Can't see any screws but don't want to just lever it and break something! Anyone know how?

 

The black plastic botton cover of the door switch module hides the screw holding it in place. You can remove the cover by pushing the rear end of the cover down and then backwards of the car. Once released you will see 2 screws next each other, one holding door handle, one switch module. According service manual the one what is quite deep in its hole is the one holding module. Screw are Torx type.

 

That's great, many thanks