The other quadruple hush (caused by rollback) happened to a Flip I Lino crew (JP was the captain). They got the first engine running again about 3500 ft above the sea north of Brunei and finally made it to Singapore with three engines running.
Like the Oz crew, they were flying close to large Cb activity at high altitude.
The interesting thing (to me) was that both crews were cruising with the TMS in TGT/SYNC mode.
Now, we abandoned this mode of the TMS as worse than useless right at the beginning in 1987 for it was a contradiction in terms. (In effect, it only regulated TGT on the master engine and allowed the other three to float whilst regulating SYNC).
The Flip I Lino crews were initially trained by us in UK and were warned about using TGT/SYNC. However, whilst they were waiting for their aircraft to be delivered, they were given further training in OZ.
I have often wondered, if having one engine roll back in icing conditions and having TGT/SYNC selected, dragged the other three back with it?
In any event, all the engines have since have been modified and I am now retired so I suppose I don't give a stuff one way or the other!