1989 300-e W124 M103 six cyliner engine. Noticed vacumn door locks, trunk and gas door just quit. I check the Mercedes-Benz CD on the W124 series very confusing to me.
I was told to check fuses the fuse that controls the door vacuum locks also work the electric antenna, that works and the fuse looks good. How can I proceed what is next to check.

I also tried to use the passender door and trunk with the key also no response. could it be the vacuum pump under rear set?

Could use some solid suggestions.

Thank You
bob Geco
1989 300-E sedan