Thanks, Sooby!
The scales must've come with the plant, I would imagine, unless something got in through the window. I purchased it maybe 5-6 months ago from a Home Depot type store here in Berlin. It's the only plant in that room, but it sits near a window that is often cracked open. I'm monitoring my other plants to make sure they don't develop the scales. Any tips for preventative treatment? Gentle washing? Plant oil?
I'm going to try save it, though it's pretty tricky removing all the scales, because some are deep in the folds of the palm branches and trunk. :(
Thanks again!