Performed semiannual maintenance on one heat pump cooling system and inspected all performance, mechanical and safety systems. Removed all leaves and debris from base pan of the outdoor unit, and cleaned and washed condenser coils to ensure maximum heat transfer of the refrigerant. Added a drain treatment into the primary drain line to help reduce drain blockages. Changed out the old AprilAire 210 filter with a new client provided one. No major issues found. Everything is working at this time.