On Tuesday, May 14, 2019 at 6:55:17 AM UTC-7, Bob Engelhardt wrote:
Are these "bulging"? How much bulge is too much? Or is _any_ bulging
to much? "If you can see that it's not flat, it's too much"?

https://imgur.com/GymXlUb

That doesn't look like a problem at all. The "X" dents in the top of the
capacitor are a pressure-relief scheme, intended to rupture if steam
forms inside the capacitor, and there's no sign those are under stress.

A must-replace scenario is when the "X" has ruptured and fluid is seen leaking,
or (sometimes) the rubber seal on the other end of the capacitor has
failed, which sometimes lifts the entire aluminum shell. A significant
bulge but NO leaking means that there has been some overheating, which
can mean a rectifier has shorted and the capacitor is not the main problem.

Many low-ESR capacitor failures have occurred in recent decades, but these
look like general-purpose capacitors, not known for high failure rates. If they
are forty years old, replacement might be a good idea regardless.