RESSAC Technician arrived at supermarket in Walnut Creek to perform preventative maintenance on eleven Trane split systems. The technician changed all of the unit's belts and filters and noted a number of deficiencies on different units. These deficiencies were relayed to the company for approval of repairs. After the maintenance was performed, the technician called the company that managed the alarms at this store to verify that everything looked good from their HVAC Controls monitoring system. Units were all operating optimally when technician left.