When you tested the caps, did you all write down all the results? (I see you logged the power supply results, so I'm guessing you all likely did for the caps too, but you didn't say explicitly.) You all haven't by any chance gone back and re-measured any of those caps, have you? (Again, standard PM likely doesn't include measuring individual components - although if you're not seeing any drift in the results, that's likely a sign that the components aren't 'evolving'.) If so, that would be really informative data about the longevity of these particular electrolytics. I say "these particular" because I'm starting to suspect that different electrolytics behave differently - likely because of fine details of internal construction, chemistry, etc. And it might even be details that the manufacturers were not aware of. I am reminded of a story (which I don't have time to chase down, to make sure I have the details right) from the SR-71, or maybe it was some NASA gear. Things all of a sudden started to fail in a way they had not before; after a great deal of investigation, it turned out something really minor had changed in the water supply to the manufacturing facility (perhaps they had started doing municipal fluoridation, I think). Noel