..it's not what you would think by looking at this picture.
7 pin miniature, B7G, heptal, small button. Too much cool nomenclature, if I had to pick one, it'd probably be "small button", just to pare down those who would know what I'm talking about..
AO-29 guts. Pretty clean considering the blanket of dust top side. Healthy amount of in/out going on at the bottom of the frame
AO-14 guts. Let's take a closer look.
Coupling capacitor failure. Interesting failure mode without the presence of burn marks or signs of violent expansion, looks more like to just extended its innards, like a push up popsicle.
However, the mica domino that was bypassing AC mains hash followed a different path to failure.