http://rex.com.au/MediaRelease/Files...ury-Sydney.pdf
Rex themselves put out a comprehensively detailed press release.
Originally Posted by Rex Press Release
Regional Express (Rex) flight ZL768 operating from Albury to Sydney on 17 March 2017
experienced an event associated with the aircraft’s right propeller assembly. The crew
followed standard operating procedures and the aircraft landed normally and on-time at
Sydney Airport.
So apparently it was just an event, and the most important thing is that they landed on time....