Basically there is no way in the real world it costs that much to repair both amps.
The real problem here is fear of the unknown, all you have to do is find a local company that carries out Audio Video repairs and have them carry out the work.
A transformer is simply a winding made every day anywhere and caps also, it is good to do both for sound quality. It needs an honest man to look at them, not a magician. So go find someone and relax.

