Our plumber came and checked the drains. As we more or less expected, they are not plugged. The water issue is entirely with the washer itself. I only wish I'd remembered to get a gift for Steve-the-Plumber like I did for our propane service. Still, we had a nice chat while he checked out the drains. This is the first time he's been by the place since we finished the carport, for example, so he got a look at that.