Homeowner is selling their home and it was inspected this morning. The HVAC unit failed inspection due to a clogged drain line. There was a small amount of water inside the furnace, after testing the system to see if I can replicate the issue I was not able to pinpoint where the leak was coming from. I did find that the drain line was clogged. I recommended a cleaning and the homeowner approved the repairs. I poured 2 gallons of water mixed with cleaner and then an additional 2 gallons to ensure proper drain function. At this time the system is operating properly and the drain line is functioning properly.