My doors always lock and always unlock but they are SLOW (1-3): is this an indication of a mechanical issue that could be fixed by servicing/greasing the internal components or does it sound like it's a vacuum issue.

To my knowledge I don't have any other vaccum system-related issues since the tranny shifts smoothly, the car shuts off quickly, fuel door locks/unlocks perfectly, etc.

Please let me know -
James

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1987 Mercedes 300SDL; SOLD
1985 Mercedes 300D; SOLD
2006 Honda Pilot - wife's ride; 122K;
1995 Toyota Land Cruiser - 3X locked; 182K