Thanks! I didn't remember having to remove the old device first. I assumed if I removed the old device before replacing it that old the device would just "disappear" from the scene, or program. I am replacing like-for-like - the old device failed so I was just swapping in a new 2477S.
There used to be an option to replace a defective device easily in the UI but that option seems to have disappeared over time. What's the easiest way to remove/replace an existing Insteon device in all programs, scenes, etc?