I have a 407DR that quit on me. Bad filter cap. Replaced all other suspect caps and anything else that looked like it might fail.
Mine has two 6.3 VAC-5 amp outputs that did not have fuses, which I added.
My manual was a joke, so many differences from the equipment plus different capacitor values for different s/n ranges. Use schematic and parts lists as a guide, I don't think the capacitors were critical in value or, the circuits would not have worked in the first place.
Added a diode across H.V. output in reverse bias. I also added a 1N4007 diode each, (in reverse bias), across both C10 and C11, 100uf/500VDC caps that are in series, for what it was worth, in case some accidental short or something, would not allow, (hopefully) that one cap, reverse charge the other.
After rebuild, checked specifications and used mfg test procedure;...passed with no problems