DEC H7104-D power supply tips?

Hi all -- My call for a VAX-11/750 a month or so ago actually bore some fruit (locally, even!) and as of a couple of weeks ago, I now have a very nicely configured 11/750 system taking up most of the basement. The previous owner got it after it was retired from a local(ish) university in the mid 1990s and it has not been powered on since then. Apparently at the time of its retirement the power supplies were exhibiting "random issues." (No more detail is available than that on the history...) At any rate, I went through the two power supplies (and the small pilot supply in the power controller) and found a lot of leaky capacitors (as in, yellow/brown goo was coming out of maybe 2/3 of them) so I went ahead and recapped the whole thing. At the moment I have things running on a dummy load in the 11/750 chassis. (the harnesses are still hooked to the chassis backplane, but all cards have been pulled, and the backplanes thoroughly checked for bent pins, etc.) The H7104-C (2.5V) supply seems to be working fine but the main 5V supply in the H7104-D is not doing so well (and as a result the other voltages it's supposed to be producing are also not present). The Power Controller lights up the "Reg. Fail" lamp (I don't know why the 5V Fail lamp isn't also on) and the 5V supply emits a loud (somewhere around 400Hz?) whine/squeal. I get about .3V out of it with a load. Without a load there's no squeal and I get about 5.6V, but that's not particularly useful. I've double-checked everything in the H7104-D and there's nothing obviously wrong (no caps installed backwards, no scorched components). At the moment the H7104-D is hooked up only to a dummy load, so it's not anything on the backplane shorting out or causing issues. This is another one of those cases where I've gotten myself in over my head with large, complicated power supplies -- anyone have any experience with these? Any tips? Thanks as always, Josh