I was informed yesterday that my brake lights weren't working. I've been trying to diagnose the problem and checked up on related threads, but it seems I have a unique situation for which I need some advice.

Long story, short:
-Both brake lights out at same time.
-Tail lights work.
-3rd brake light works (so brake switch seems to not be the issue).
-Checked any related fuses (according to manual), no sign any of them are blown.
-Swapped out the yellow #3 fuse in the relay fuse box, per a suggestion from another thread; no luck.

Have any of you experienced this issue before, or have a remedy?