Performed CMA Full Service on 4 Rooftop Gas Pack Units, 2 make up air units, 2 condensers, and 1 DOAS system. Technician also ensured exhaust fans were operating during the time of maintenance. Challenge - GP 2 - technician observed circuit 1 not operating. There was a call for Y1 and Y2, however only circuit 2 was operating. Previous notes recommended a leak search of circuit 1 given that the system was likely low on refrigerant. Leak search performed and a leak was found in the evaporator coil of circuit 1 (video and picture provided). Office notified and a quote will be built with a goal to repair the leak. Challenge - GP 4 - upon arrival to the system the tech discovered that circuit 1 was not operating, similar to GP 2. Technician inspected system and found compressor to be reading GOOD, no challenges in terms of electrical. Tech then leak searched the evaporator coil and found a couple of leaks on the bottom portion of the coil (video and pictures provided). Coil is heavily rus