The info I just heard related to a ballast weight which hangs under the hub/blade root (not too sure with L2) and that a washer (I think was said) may have caused the problem. Other companies L2's taken offline for checks and possible replacement of these shimmys/washers. Understand 1 Scotia L2 back online this afternoon after replacment, though problem now is they need more replacements from Eurocopter for the rest of the fleet. I also hear rumour that Scotia and HS may do scheduled checks on this part already, but Norsk might do now.
This is just info I gathered this evening, hopefully someone else can be more specific.