Preformed cooling maintenance. Tested all electrical components on the inside and outdoor units. Tested start amps and run amps for the compressor and fan motors. All tested within manufacture specifications. Treated drain line with total c. Replaced filter with another Aprilaire 210 filter customer provided. Noticed the unit didn’t have surge protection, with recent events that caused a power outage we provided client with options to add surge protection for the unit inside and out. Upon departure unit was in working order.