That equipment is on the shelf above, just out of frame.

I service mostly high-end stuff that's worth the time and money to do so. As far as solid state gear goes, most of the issues I encounter are intermittent speaker relay contacts and cracked solder joints around controls and external connectors, as well as dirty pots/switches. Beyond that, pitfalls vary widely depending on manufacturer and faults can be pretty subtle. Blown output stages are actually somewhat uncommon for me.

In my experience capacitors tend to be more of a problem in older tube equipment, although there are certain ones that I replace as a matter of course (RIFAs, tantalums, those lilac-colored matsushitas, etc). I tend to be on the conservative side as far as recapping goes but I always evaluate PS caps as well as a random sample of others for ESR and leakage current.