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It does indeed sound like the power supply. What I would do intially is what you suggested - take a look inside at the capacitors... not just for leaking ones, but for any with buldges. If the top is not perfectly flat then it should be replaced. Caps that are good will be perfectly flat and absolutely no bulding around the X.
Sorry... I had an internet outage.
The only thing I have is a block diagram. But that might be helpful. I am going to attach it here for you. Just click on it to download.
I don't. I haven't been able to find one, but I know it's available. They do publish service manuals for these - maybe not in digital form, though, and I don't happen to have a hard copy. Still looking for you, though.
It could be, but I don't know the value of a specific diode without the schematic. I think it is more likely to be a cap. A diode will usually be blown or not blown. Caps can't really be tested in place, though.
I would only be concerned about the electrolytics. Of course, while it could be any single component at all, if I'm trying to save you time by pointing out the most likely culprits, electrolytic capacitors would be, by far number one.... and by that I mean, at least half the time... probably more.