Okay, unwrapping a shorted capacitor or one that had failed I would expect the appearance you depicted! My point is if the capacitor reforms with low leakage and an even lower leakage is observed after 100 hours, the capacitor should have no problem in service for 1000 hours.
Again I am inclined to open a good capacitor of this vintage and not one that has failed. The key is that the leakage remains low over time.
And do you honestly intend to run your sets hundreds of hours?
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