Hi Good People,
I have a 1985 300D, unknown mileage (ODO stopped at 118k)
I recently had problems with the vaccum lines, causing the ignition and door locks to malfunction. I secured the vaccum lines from all leaks and everything works well again.

The problem now is there is a slight squeal coming from the left front of the engine.
Here is the breakdown:

I noticed before the vaccum lines started leaking, that while driving, a loud squeal would occur once in a while.
Then the vaccum lines started leaking and the ocassional loud squeal went away.
Now after i repaired the vaccum lines this squeal is now constent but not as loud.
Could this be a sign of Vaccum Pump Failure?