The customer was experiencing cooling issues with their home's air conditioner. Upon arrival, I inspected the system and found that the drain line was clogged. I used a chemical to break up the clog and then flushed the drain line with a vacuum and four gallons of water. After flushing the drain line, I was able to restore proper suction and the system was cooling properly. I also cleaned the coil pan, which had a lot of gunk in it. The drain line is now draining correctly, and the system is cooling great. The customer wanted me to email them a payment link for the $79 diagnostic fee.