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Are you putting it into first as you're slowing down with the clutch in? If so, what you're probably hearing is the faint whine of the gears as the synchros force the transmission input shaft up to a higher speed. (In 1st, the input shaft is at a shorter ratio to the output shaft, thus engaging 1st at a given speed requires a higher rpm).
Or in other words, it's normal, nothing to be concerned about.
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