Well, after talking with Reaper on the phone, I took the board out of the case and examined the capacitors with a magnifying glass (I have old eyes) and I found one that looks like it may have 'burst'.
When I've seen blow capacitors in the past they've been visibly fattened around the middle or actually exploded with shredded paper and black 'burn' marks. This one looks like it puffed out a bit at the top but it's still 'sort of' functioning.
Looking directly down on the top you can clearly see that the capacitor is cracked open. It isn't clear from this angle.