Alarm Microswitch

[KermitF]

Gents,

I have the standard driver's side door lock problem where you unlock the door and the alarm goes off (on my '90 300E). Per my searches, it appears that this is most likely due to a bad alarm microswitch. I have located a good driver's door in the junkyard and would like to extract the alarm microswitch for use in my door, as dealer has quoted me $146 for replacement part. I want to keep the alarm feature, rather than disconnect from box on passenger side floorboard. A couple of questions:


1. What are chances switch could require just cleaning as opposed to replacement?


2. Is use of junkyard part (on a pretty decent 300E) a really bad idea for this part?

3. Has anyone got a picture of what this part looks like?

Thx,

KermitF