FTA:

> it was clear what the problem was with a swollen C812 capacitor.

> So no need to check anything with a multimeter or an oscilloscope, a visual inspection of the board could immediately detect the issue.

I'm looking at the picture. I'm not in electronics and I can assure you it's absolutely not clear to me that this is the capacitor I'm looking for. So what should it look like ? I understand these things sometimes burn or swell but is it always visible ? And if not, what should I do to detect it ?