Highly unlikely for a 2009 Riv, but no one has mentioned it: check around bottom bracket shell for cracks. I had a Schwinn Voyageur crack were the seattube met the bottom bracket shell. The tube had almost clear through with a bit of the bb lug. Examining it after, it had been a very slow crack that had been clicking for a while before it became structurally noticeable. Again, very unlikely but worth taking a look. David River Grove, IL
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