Upon arrival, I found that the primary drain had a slow drain. The primary was empty. I checked for back pressure with my mouth and found it to be clogged. The water was going in to the emergency pan. The water stain came from the keeper screw ,holding the emergency drain to the pan, not being tight. I tightened the screw and used a shop vac and pressure to clear the drain. Also, I used the accumulated water from the leaking pan to flush the drain and followed it with some drain cleaner. It was half a bucket of water. The customer and I spoke about redoing the drain under the sink to allow more access and adding a wet switch to the emergency pan. Customer declined further repairs.
