so glad i found this thread.
my psm and abs lights came on yesterday and i noticed that the brake lights weren't working last night. called my local porsche dealership and the parts department is closed today for inventory. ended up stumbling on this thread.
turns out that my switch just needed a good cleaning. took out the switch, opened it up, cleaned out all the metal contacts with isopropyl alcohol. put everything back together and the problem appears to be cleared up. it's daytime now, and i'm by myself, so i can't actually see the brake lights, but the dash indicators have disappeared. hopefully that's all it needed.
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