Ha I remeber working on those sets as recent as a few years ago....there are still some going that the jugs were replaced under warranty,when they came in the shop theyusually were dead because of bleeding low voltage electrolytics,that is what collectors in the future will have to face....eaten away traces on the pcb's from the leaking caps,any peice of electronic equipment from 1988 and up that uses black nichicon capacitors will have have this problem,however their other series with the blue cases are unaffected by this problem....still dont understand why,probabaly a different electrolyte formula that didn't eat the rubber.

EDIT:I forgot to mention that usually the caps start leaking after about 12 years of service on average