Amp repair in Orange County, CA for Carver WM-200t

A lady I work with at a church wants me to sell two Carver WM-200t amps for her.
However, I have no way of testing them to see if they work correctly.
So before selling, I need to have them checked out.

Is there a recommended amp repair shop here in Orange County? Open to Los Angeles shops if there's nothing here in OC.