Decided to "delay" tackling the mirror rework. While I've been researching the mirror has gone back to "day" mode. At least mostly since there is still a small "oil" mark in the lower right corner. Since I'm a big believer in not doing today what can be put off till tomorrow I will not do the repair ...

Wow, thanks for the great post w/ pictures. I suppose this would work for other models as well.
Dave, this should work for any car with the Magna Donnelly UEM mirror (all P1 cars through MY 2008, except C70, S40 (-04), and C30 [Delphi UEM]; and all P2 cars through MY 2008.

vegasjetskier and ...

Thanks so much for including this in the database. It was very helpful. I know that when I pulled my old leather armrest off the round piston looking plastic piece pulled off of the inverted y plastic piece and the spring. I knew it looked like the piston piece should go down and compress the spring ...