I'd get the service done ASAP. That multi-section can filter capacitor appears to be original. Many techs avoided changing them for many years for a couple of reasons - 1) they were thought to be a pain in the a**, and 2) for a long time replacements were poor quality. But they are not that hard to replace, and several companies such as F&T & JJ (among many others) make replacements - and it's also easy to simply bypass the can and install individual caps on the chassis (this wasn't common when everyone was using huge Sprague Atoms, but those are now overpriced and lesser quality). If that can is original and a section blows you could lose *another* power transformer. I always recommend that newly purchased Fender tube amps over 20 years old go directly to a tech. Virtually every one I see has old parts that are past their service life - most being filter caps. Sadly, most are brought to me because something has blown in a players "new amp". Please - take it to a tech.