WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Fatigue Spalling
Courtesy of GENERAL MOTORS CORP.
Flaked surface metal that results from fatigue. Replace the bearing. Clean all related parts.