Arrived to perform Ac tune up. Customer has no concerns Set thermostat call for cooling Observe indoor unit, washing air filter, condensate system, coils and performed temperature readings Observe out door unit, service coils, electrical compartment, motors, refrigerate lines The customer has 6 indoor units. Of which only 4 working good. The other 2 have to be made a diagnostic to determine the failure, the customer says that they are possibly the fuses. The condenser units is located in the roof needed a extension letter 40 feets. I observed that the indoor units were dirty and I tried to clean them, but the dust is attached and it is difficult to remove. Recommended to wash all 4 units with acid wash and Pressure washing $2,316.90 tax included. Minor diagnostics $181.97