A restaurant in Yorba Linda California reported that all their AC units had gone down. Our commercial HVAC technician for the area responded, find all units very dirty with clogged coils and filters. RTU3 had a locked condenser fan motor, and someone had already disconnected a bad compressor on circuit #2. Compressor #1 had burnt wiring and was running on high head pressure. RTU1 had blown fuses, which the tech was able to replace to get it running. #2 and #6 will need additional time to troubleshoot and resolve.