Just purchased a 2015 S. Has a slight musty smell. Pulled the filter and cleaned the coils with a foaming spray cleaner. While I had the drain tube off I ran an endoscope in to see if there was any mold or fouling. Looks normal to me. Hope he cleaner does the trick.
https://photos.app.goo.gl/9JYi1dFArxvBbniN9
https://photos.app.goo.gl/9JYi1dFArxvBbniN9