We see many Fender amps in for repair, it's not because they're unreliable its because they are a popular amp and therefore more likely to see.  In particular we regularly repair hot rod deluxe, and deville combo valve amplifiers.

 

Repairs to fix these broken Fender amps include:

 

Fixing crackly pots 

Replacing capacitors causing hum

repairing intermittent problems with amp breaking down

Re valving and biasing 

Foot pedal repairs