Death by Old PSUs

I just read a mail list posting in which a friend explained how he had to shut down and number of servers in a data center for facilities maintenance for the first time in six years -- the machines had all been running non-stop for the whole time. On restart a significant number failed because -- it is suspected -- the power supplies which could supply power for normal operation could no longer handle startup conditions! The suspicion is that electrolyte evaporation in the PSU capacitors is the most likely cause!

Wow. Is there a disaster waiting to happen in your data center? I did a quick search on this topic but not being an electrical engineer I may not have been using the right search terms. Anyone know anything about this problem?