A mechanic named Solo Bolo (left) talks with a customer named <PERSON> about her air conditioning problem Wednesday April 30, 2014 in Oakland, Calif. His tools are in the foreground. A group of automobile mechanics work in the parking lot of the AutoZone at Bancroft and 73rd Avenue are doing various repairs for a fraction of the cost of a real-live certified mechanic. Photo: <PERSON>, The Chronicle