WARNING: This page is about a different car, the 2002 Ford Pickup, 2002 Ford F550 Super Duty, and 2002 Ford F450 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Damaged Shaft (By Fine Brinelling)
Courtesy of FORD MOTOR CO.
The term describes a brightly polished race surface with signs of consecutive depressions. The damage is a combination of brinelling and wear.