Precision Fidelity M-7A power amp problems

Does anyone know a shop that is familiar with and repairs PF M-7A amps? Mine keeps blowing fuses.
The same thing happened to mine, the filter caps shorted, although others have had TIP50 transistor failures, coupled with the connected Zener diodes.I know this is an old post, but it may be helpful to you or others looking for info
Did you repair it yourself, or send it out? If you sent it out, who to? Thanks for the reply.