Seeing several pictures with the rusting on the drive shaft and U-joint in here. I have a 2015 GS and had this issue with around 12000 miles on the bike. No tears with the boots...ect. Took my bike in last summer and BMW changed out the drive shaft under warranty. Dealer stated that the new drive shaft was now painted or coated. So hopefully this reduces the chance of this happening again. Haven't taken it apart yet to see if they were telling the truth about that though.