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See if you can (re) create the sound other ways to isolate the cause. Or just wait to see if it appears in other scenarios, or changes with time.
For example, if it is the throwout bearing, it ought to make the sound any time you depress the clutch and not just on downshifting. Try downshifting earlier or later than usual to see if the sound changes, or perhaps it may reveal that the timing of the sound with downshifting was coincidental, etc.
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