2014 squeales on left turns

Toller

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2014 CX9 Touring
Our CX9 has just started squealing on left hand turns. We just had the recalled suspension parts replaced the day before, so assumed it had to do with that. The mechanic says they couldn't make anything squeal. He says a stone has gotten into the steering and is harmless. Driving in reverse and making a series of turns right ans left will crush the stone and eliminate the noise.

We tried that. It maybe made it more intermittent, but didn't eliminate it.
Any thought?
Right idea about the problem?
Right "repair"?
Harmless?

Thanks
 
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