Responded to call for partial power outage. Upon arrival customer advised Ga Power has already responded and advised problem is internal. Inspected panel. Found panel on carport is an interior panel and not an exterior electrical panel. Found all breakers in panel are extremely worn. Tested power at main lugs. Found 240 on B phase and no power to A phase. Advised customer of diagnosis fee to locate issue. Customer advised he is not the home owner and will need to advised home owner before proceeding. Customer stated home owner is an attorney and will not answer the phone but will return his call when available. Thank you. Eric Messer.