JFZ90; Are you sure you have got that right? It is my understandaing that the only piping that has been replaced is the section which caused the XV227 incident. Not ALL hot piping in the a/c; that is part of the "lifing" study.
To be fair, I don't know and there is not enough information available, hence I will speculate no further as it is inappropriate. I was just trying to point out in my post that some of the conclusions above that "mtn policy not in place until Dec 07 = bad" is not necessarily a valid conclusion.
From what I can see above however, it appears that:
a) the issue has been taken seriously post BoI and tackled.
b) whilst the detail is not known to me, in broad terms the approach appears valid and robust and contains the kind of measures I would expect. By this I mean it is multifaceted - not just replacing offending pipes (as a car mechanic may do and send you off hoping it doesn't break again), but looking further to try and understand the failure mechanisms and put in place mitigating measures over the long term (as you'd expect a professional airworthiness outfit to do).