I too have seldom heard of these bearings failing. I would think removing the FW and reinstalling the wheel to inspect the adjustment of the hub may be a good idea. if your unfamiliar with bicycle maintenance I suggest finding a competent and qualified mechanic. these Mavic hubs need special tools to remove and install the bearings.
these may help but again you need special tools for this job.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk