Friend and I checked our bearings and both found this on our 2013, 163 Pro's at 1500 and 2000 kms . Of course both machines are going to need new driveshafts. The only thing I noticed was a clicking sound and a could feel it in left running board on occassion but htought it was ice build up. This happened almost from day 1. My buddy had no clue there was an issue.
The 600 of mine with similar km's, looks fine.