Quote: "Also, since you have the door panel off even if the one you test is OK it might make sense to replace the rubber diaphragms anyway to ensure you won't be facing trouble later"
I don't have the panels off yet...I was hoping I could find where the lines connect: going to the driver door/the Y going to passenger doors and the back on the lock and unlock sides. The lines look like they are under a protective layer I hate to tear into. It's different from the w123. If I get the panel off, I will change out some diaphragms.
I am losing vacuum on the lock side of the vacuum switch.

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'85 300TD W123
'83 300D W123, Daughter's
'80 300SD W116