Here's a puzzler in the spirit of "Car Talk" for the mechanical gurus on the post. I get a very loud chirp (like a starling) when I shift into the smaller cogs, and a continuous loud chirp (like a flock of starlings) on the second smallest cog . No chirp on the larger ones or the smallest. I can't replicate it in my repair stand, but it definitely seems to emanate from the smaller cluster. Cleaned and lubed chain to no avail.
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