Most all components can be repaired by a good tech unless a part is no longer available like a CD laser. My friend fixes components for local audio shops here in New Jersey without any real issues.
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If a tech has a schematic and replacement parts are available, it can generally be fixed.
Swampwalker is correct - tube gear is generally easier, and it's important to point out that when you retube a piece of tube gear, you largely have a new piece of equipment.
A problem that some solid-state amp manufacturers would rather not acknowledge is output transistors going out of production - "boat anchor" is exactly what you'd have if you lose an output transistor in such a case.