Came out to perform preventative maintenance on 3 systems for customer. Discussed with customer about maintenance needed, and if she’s had any issues. Changed out all electronic air cleaner filters for customer in home. Inspected all blower assemblies, motors, electrical components, evaporator coils, drains and condition of equipment. Washed condenser coils thoroughly and inspected condenser coils, capacitors, contactors, compressors, fan motors and operation of equipment. Checked thermostat operation, wiring, amps, temperatures and pressures. As of right now, the systems are all still operating properly. I still recommend customer plan on replacing the unit in the attic that runs the zone system.