Good DIY. I do have a slightly different problem with the mirror. I fixed the switch and both mirrors will open and collape(fold back) in sync. The problem I have is that one of the mirror will "lock" in place when it is in the normal position but a slight knock on it or if the door is closed a bit harder, the mirror unit will come lose as if the "locking" has been dis-engaged. I could press the button, collape and open it again to "lock" it is place but it will get lose again. I don't see anything been worn out on the mirror internals.

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2004 X5 3.0d Toledo Blue