Many electrolytic capacitors fail if they aren’t used regularly. There are even rules in manufacturing about how to recondition capacitors before soldering them if they’ve been stored for a while.
Temperature is an issue for electrolytic caps because it causes the electrolyte to degrade. Usually if there is a lot of ripple that they have to manage.
Electrolytic caps are the worst for reliability.
i did check the capacitors- didn’t find any that were bulging or split- but of course they could have just failed without any signs- or i could have not seen one that did split (some were tucked in pretty tight spots, and hard to see)