Upon my arrival I performed a 6 month check up 4 mini split systems. I found the upstairs, wife’s bedroom and the barn craft room all to be operating properly in both the performance and safety aspects of the equipment. I found the downstairs carrier system was extremely low on refrigerant and has developed a leak on the heat transfer media coil. I spoke with the customer about his different options for repair and he chose to go with HL1D. We will need to schedule a return to perform the repair. I left this system turned off at the disconnect to prevent any further damage. I also secured the drain line coming from the upstairs unit upon the customers request.