Over the next few days I plan on taking care of the vacuum leaks that've plagued my car since I've had it. Now, is it common for the actual lines to leak, or just the connectors? All of the connectors seem to be original to the car, so I'd like to go through and replace all of the rubber on the lines and see where that gets me (I'm putting in a new interior, so the car is bare now). After that, if problems persist, I plan on isolating the actuators and testing them with the mityvac. Is this a good plan of action, or am I looking at this the wrong way?

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1980 240D, 197580 miles - "The Stuttgart Stomper"