There was a change in August 2010 regarding the bearings seizing up, they had an extra ring added inside. The only other bulletins referencing fusing issues was from 2008 production. Probably long since resolved, it was just a poly slider added to the e-ring to prevent catching.
If your bearings don't have the additional ring inside them, it's pre August 2010, but that still leaves a very narrow gap from March to August - about the best you could do.
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