Recently one of the LDOF Faithful mentioned there was a plug in the refrigerator drain hose. I had no idea! Despite a bit of lower back pain, I crawled underneath, removed and cleaned that plug. It wasn’t terribly dirty after 11 years but it needed a rinse. This small item is now on my annual maintenance list.
I don’t remember the person who mentioned this information but I’d like to thank them. 🙏