We got lucky, today. Mom called for diploma (dat's diguy who fixes dipipes), & he arrived with his assistant this morning, to see why our upstairs fixtures were backing up.
It seems that, in the process of his having replaced a badly corroded stand pipe (for escaping sewer gases, among other things) as it ran through the attic & out the rooftop, he knocked a little bit of the old iron pipe downward into the depths of pipe below. It wasn't much, but what there was, was enough to catch in the gradually growing roots on the way to the sewer. Had he not been called back to clean out the little bit of chaff he'd dropped, we'd have had the roots grow really big in the pipe, & we'd have had a very big plumbing problem in time. As it was, he and his assistant spent a total of 2 hours, including cleanup, and the main drain was easily cleared, when he got to it.
So, as I said, we got lucky. Two small things combined to make a medium problem, and... well, we can rest easily, tonight.
Which is why I've been wandering around the house all afternoon humming this eminently hummable ditty,
and expecting it will stick with yooooooh-ooh-ooh-ooh-oooh, too.
If you're lucky, you can thank me later.
BTW, some clothes from the disco era should not be revived. Like her hat. Sadly, I think it showed up at a royal wedding, last April.