Upon my arrival I evaluated 3 carrier heat pump systems. I verified system safety and performance is to manufacture specifications. Flushed and treated the water removal systems. Cleaned the electrical cabinets and washed units using water. Found unit # threes air movement system to be quite dirty, restricting airflow, let customer know of the issue, requested options for repair sent over to her. No other issues at this time. Other 2 systems operating to manufactures specifications