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I'm not sure how to fix it, but I know how NOT to: Don't try oiling the pump itself. The vanes may be made of graphite or similar and oil is supposed to degrade them.
I don't know about that particular pump, but some enterprising people on this board and the other got the bearings out of mid-80's models and a good bearing place should be able to match yours if you can disassemble it.
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