DCM1: AC complete, replaced 20x22x1 filter. System is fully functional and operating within manufacturer specifications at this time. Refrigerant pressures and temperatures are appropriate for indoor and outdoor weather conditions. Found there is no surge protector on the outdoor system. System has an inverter drive board, inverter drives are known to fail due voltage fluctuating below desired voltage. Talked to homeowner about adding a line voltage monitor and surge protector to protect outdoor components from voltage spikes, drops and etc. They decided to go ahead and get the line voltage monitor due to warranty expiring soon.