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RE: Troubleshooting a JE Labs 300b amp

Would a degrading capacitor in the PS necessarily cause voltage to fall? I saw 4V difference between amps at the PS capacitor-output transformer junction, and the same 4V difference (or very close to that) at the 300B plate. This seems pretty consistent from when I built the amps (circa 2002).
The PS caps are paper-in-oil, and I have not seen any physical indications of leaks.
The 6SN7 cathode cap is a Black Gate. The coupling cap is an oil filled cap (I believe .22uf). All the iron is Hammond (300BX power, 1627SE output, 193J choke)

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