The single bad cap on the power supply assembly, shown in my original post.

I had my ES10 recapped about 12 years ago. That I can recall, only the bad caps were replaced. I vaguely remember that he was unsure or a few caps, and just replaced those as well. I do not believe that he replaced all of the caps on the board, just anything confirmed bad or suspect. (My recap job was done by a coworker, and cost me about $15 -- which probably included both the caps and his lunch that day.)