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Jordan,
I don't have a 465B manual with me, but 40 mv rms does sound a little on the
high side. I believe that would be about 113 volts pp, [(RMS x 1.414) x
2=P-P not exactly a sine wave but close enough]. Having a scope to trouble
shoot the scope is always helpful, but in a case like this I've used clip leads
to parallel an equivalent or larger capacitor across the suspect power supply
filter caps in the circuit, and then observe the results on screen. (Make
doubly sure the working voltage of the cap is high enough.) This test doesn't
always work because the filter cap could be failing toward short and not
failing toward open thereby negating the added capacitance.

Ron,
Nice picture, labels and all. I can even count on the graticule 8 small
divisions between the start of each darkened portion. That translates to an 8
ms period, or a frequency of 125 Hz. This would be well within the margin of
error to be 120 Hz ripple from the full wave bridge in one of the supplies.
I agree you have a similar problem with AC mains.

George