I just noticed that Ben Sandilands (in his "Plane Talking" blog) is advising that Rex broke air safety rules by feathering the prop after noticing a malfunction and then flew from Canberra at 8000 feet.
https://blogs.crikey.com.au/planetal...7/03/20/62116/
However on FR24 the aircraft is seen to be flying at FL17 nearly all the way to Sydney before beginning a seemingly normal descent.
The mystery deepens...