So this is what the Qantas/CASA representative says to the ABC -
"As it turned out, it was one washer on one bolt on one engine that had been incorrectly installed. And naturally that shouldn't happen, but that's the scope of what it was," he said.
Then wtf did I get this in a letter from the ATSB at the time as a response to them from CASA about the problems on 3 engines? It was then published in the Flight Safety magazine.