4:26 AM: Thanks for the tip about an outage in the south Arbor Heights/Arroyos/Seola area. Seattle City Light‘s map says 106 homes are without power; no cause listed so far. (This is near the area where City Light plans to start a project soon to replace underground cable, with an informational open house this Wednesday.)
7:45 AM:: As commenters note, SCL has since updated to blame a tree.
1:25 PM: Restored since our last check a couple hours ago.