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TL;DR -- me too.
I've got the same issue as OP. My FR-S was purchased in Feb. 2013, and I've noticed the issue ever since then. It's most noticeable when driving on a highway.
Someone in this thread described the noise as "a bee buzzing between sheets of paper" -- that's exactly it. Also, the buzzing is intermittent. Might last for a few seconds, pause, -> loop.
I have 16,000 miles and the only reason I've not looked into a solution was because I really don't want a stealership to dismantle my dash and potentially do more damage working on their non-solutions. We need a damn TSB already.
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