Customer has 8 y/o Concord heat pump system that operates for basement level. System was not heating properly due to dirty filter. Replaced 12x20x1 filter. Noticed that drain line was not properly installed. Blower wheel cleaning needed. UV BlueTube operational. Heat strips are operational. Pressure levels were normal. Condenser electrical components are good. Condenser coil cleaning needed. Informed customer of findings. System is currently working.