1989 260E

My vacuum door locks have stopped working because the vaccum pump under the back seat does not appear to be producing suction.

When I turn the key in the lock, and put my ear very close to the pump, I can hear it hum -- although MUCH more faintly than its normal, louder hum, which I could hear from anywhere in the car.

Sounds like whatever motor is in there is failing. Are these pumps fixable, or do I need to replace it?

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black