I just bought a used 2006 Dyna Street Bob. After going through some papers that I got with the bike I found this statement: "An inner primary bearing replacement is required at 15,000 mile intervals." It goes on to say, "Harley-Davidson has preliminarily determined the inner primary bearing on your 2006 Dyna motorcycle will require replacement at 15,000 mile intervals. The bearing will be replaced by your authorized Harley-Davidson dealer at 15,000 miles and at subsequent 15,000 mile intervals, at no cost to you. This service requirement may change over time as we make improvements and monitor repair trends on 2006 Dyna motorcycles." Does anyone know about this? Is this still a problem?