For curiosity - slightly pressurize the old vac reservoir with it's base under water in a bowl.Look for bubbles and hissing when you elevate it bove the water level. This will be a satisfying diagnosis.
In theory you could epoxy the base of the old leaker. Why Porsche did not use a one piece blow molded part like other manufacturers do ,I have no idea. It would have been a cheaper part too !
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