from my experience with my CT:
ISSUE: squeak in the center radio console area, particularly when a passenger knee would rub and/or press against the leatherette stitched trim.
SOLUTION: trim removed (pulls up easily), felt added in the clips
NOISE GONE: 95% of the time. Only if you press really hard or hit a hard bump you might notice a tiny squeak
DIYer or LEXUS TECH: got this done by Lexus under warranty. TIME: 30 min job