The good news is a failed capacitor almost always is detectable visually. Open it up and inspect the caps. If you find the bad one, it is pretty easy to replace.
Jerry
If you think about capacitors, check out this video
One of my favorite nerd-channels posted this today. It’s about millions of faulty and/or counterfeit capacitors flooding the market in 2002 and after. If you have gear from that era, you might want to check it out.