w140 vaccum pump

I would like to get some information about the pump under the rear seat of my 1992 300se. The door locks don't go down, the back up indicators don't go up and the lumbar support dosen't work. I assume this is all related to the vaccum pump. Is there a source for a remanufactured or used one?

***the door lock LED's light up correctly***

Is there a way to fix this pump?

Thanks, Scott