I've read the interim report on the breakdown, the component that failed was 11 years old, and should have been replaced at five years. It was also kept in storage for too long before being installed.
And this wasn't a one off, either. There were a significant number of components at a similar stage in their life.
Oh I'm starting to remember now. Might have been nice for RNZ to link to previous articles so we remember what it's about. So many issues with the ferries, it's hard to keep track.