Cougar
I would think it prudent to sit on this one until the facts come out.
then gives a potential scenario
Crew press beyond PNR as fuel is all good at this point.
Wx closes in when aircraft past PNR.
Sorry correct me if I'm wrong, but the worst case scenario for Norfolk (being a remote island) would be depressurized. So the fuel calculations would be based on a point of safe diversion based on being depressurized. The PSD should therefore be beyond the island, if not try LR cruise, recalculate fuel, if not (a possible fuel leak) piss off to the nearest non-remote island/mainland (your alternate ... in this case Noumea).