I found the drain line was restricted, vacuumed out with cleaner twice. I checked pressures, electrical components. I replaced weak compressor run capacitor. I noticed the system is undersized for the house. It also seems like not enough return air. One filter was missing and the other was dirty which I took out and left beside the grill. They will need to get new filters ASAP. I noticed a little bit of growth inside the air handler. On next visit we will monitor. They have a membership with us. I left the system in good working order.