Re: broken driver's door lock
Had this exact problem on my car 500E a few months ago (105K miles). My dealer repaired it for a reasonable fee. He said it was the actuator mechanism (not a vacuum fault). It was under $200. I wouldn't be surprised, if you are inclined to DIY, to find that it is a repairable part that broke.
1995 E320 Wagon Moonstone Grey/Parchment 106K mi.
2007 E63 AMG Graphite/designo 75K mi