Upon my arrival, customer was concerned about mildew and bacterial growth on case heat transfer media coil. During my diagnosis, I found air movement system to be dirty as well. Presented options for repair and customer went with HK11A for the air movement system cleaning. Will also be cleaning heat transfer media coil case with bio protect and flushing drain line. Customer was also concerned that master bedroom mini split was not cooling properly. Found system to be low on 410 a refrigerant due to systems condenser being high off the ground we will be returning with in-line UV dye to install and return to do a leak search with a UV light. Office will be in contact Monday to schedule a return date to complete work.