The plane that landed in Manila due to explosive decompression, many sources has pointed out that the plane is likely to be the VH-OJK, purchased by Qantas in 1991.
Two of the Sources I managed to find are the The West Australian and The Canberra Times.
However safe the plane was is really history. I don’t know about you guys but I am not about to ride in a plane that was almost blown out of the sky previously so if I were to fly QF the next time, I’d look at the tail of the plane to make sure it ain’t VH-OJK.

Huay said,
July 30, 2008 @ 9:08 am
Just DON”T fly Qantas. I’ve already boycotted this awful airline. Poor service, irritating gay stewards, snobbish old stewardesses, horrible food, PLUS they caused us a delay of 1.5 days on our last flight from Syd - Sin.