AC maintenance. Cleaned and serviced condensing unit due to maintenance plan. Changed furnace filter that customer provided. Tested capacitor, contactor, fan motor amperage, blower motor capacitor and amperage, compressor amperage. Everything was in adequate working condition. Unit was extremely dirty. Washed the coils out. Checked refrigerant levels. R410a refrigerant levels were in accurate efficiency range. Customer renewed maintenance program. One visit being used today.