That is why that Fender amp is on the do not repair list. They are made so cheaply that it is cheaper to replace them than pay for someone to fix them.
The worse case on those amps is when the pots crack at the wafer and the leads stay soldered solidly to the board. Replacing all of those pots is really not worth the trouble.
Kustom amps were built to last and to be road worthy for the working musician. That's why they used to come with a lifetime warranty.
And by the way, Kustom pots are also soldered directly to the pc board as well.