Car is 1997 E320. The plunger button on the jamb switch for the driver's door is missing. I don't know where it went. I assume I will have to replace the switch. Can switch be replaced from outside or must B pillar interior trim be removed? If this is the case it looks like I have to remove the plastic piece at the bottom of the pillar and then remove the fabric covered trim piece that runs up to the seat belt opening. How does one remove these trim pieces without damaging them? TIA