Arrived on site for maintenance, Customer lead me to air handler and condenser. Washed down condenser with chemical and water. Air handler water pump was fully functional. Brushed out p trap. Turned all 3 ac thermostat down. Checked pressures. Pressures were fine. Checked temp split, peaked at 16. Went out, bought filter to change filter. Over all, unit is fine. Customer acknowledged update on unit's status, and signed off.