Complete prime maintenance on (2) ac systems. I inspected filter locations and changed all customer supplied filters. I cleared and flushed both drain lines with vacuum and water. I performed routine maintenance on all pieces of equipment. System 1 Downstairs: All parts and components are working properly. The air handler cabinet is clean. All indoor air quality products are working properly. System 2 Upstairs: When checking refrigerant pressures I found the system low on refrigerant. I offered to complete a leak search to pinpoint the leak. Vijay accepted. I found the evaporator coil to be leaking. I have added a video of my leak detection. We will need to order the coil and schedule the repair with Vijay. Air handler equipment info: Model- AVPEC59D14AB Serial- 1707481607 Moving forward the office will call for scheduling. Thank you for choosing Total Air!