As I said, go cutting into these pieces of junk expect problems.
They barely did any air testing once the conversion was complete. They didn’t push it hard enough to see its flaws. You can have have German or whatever engineers doing whatever you please to it on the ground, however the real test is up above. I think the failures on first leg to Perth said it all. Doomed ever since.
Which is why they most certainly should not go cutting away at Y and Z.