In article ,
wrote:

The vented cap syndrome
(VCS?) has really only been an issue since about 2004 or so. Around 2008 was the
real big explosion of top bulged caps, when we'd see TVs in warranty with
bulged/vented caps. There's been a big slowdown in bulged caps in recent years.

Sounds like this might be the "capacitor plague" problem? Bad
water-based electrolyte?

https://en.wikipedia.org/wiki/Capacitor_plague