HVAC Preventative Maintenance Roof 001 Daikin QRS990 J3254774: Preventative Maintenance - Quarterly -Inspect condensor or cooling elements. -Inspect control box, associated controls, wiring and connections. -Clean or replace air filter. -Remove and add refrigerant -Inspect conditioned airflow system (ductwork)—check for leaks. Deficiency for Roof 001 Daikin QRS990 J3254774: You can talk to type Inoperable Deficiency for Roof 001 Daikin QRS990 J3254774: Safety. Inaccessible system.