2010 honda crosstour making squealing noise?

It started about 2 weeks ago, we took it to where we bought it as it's still under warranty through them and they can't seem to figure out what's wrong with the damn thing.

its making a squealing noise from the rear end over speed bumps and while making right turns and sometimes while going straight but rarely when turning left, what could cause this noise? Every time i take it to them to have the guy ride with us to hear for the noise of course it doesn't happen but then right after we leave it starts happening! Whats back there that could be making this noise?

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