Vacumn door locking system is not working on 1990 Mercedes-Benz 300SEL

This occurred within the last 24 hours. We have owned the car for 5 years with no problem until now.

Asked by for the 1990 Mercedes-Benz 300SEL
In the trunk under your spare tire is where your vacuum pump is located. Could be a bad line or a blown fuse or even a bad pump.