Upon arrival, the customer stated she shampooed her couch and left for 4 days. Growth formation happened in the supply boots. I evaluated the cleanliness of the ductwork only per customer request. I found the system does have some build up in the ducts. While in the attic, I heard the drain gurgle, and I had a look. I found the drain looks like a clogged artery. The customer stated it drips outside. The plenums have a heavy layer of dust on it. The home has a humidity issue. Customer stated she had a smell that I can no longer smell. I assumed a refrigerant issue, but it was determined to be an undersized system. The home is around 1800sqft with a 3 ton system on it.