John, Cantabria is hardly a "first of class" she is a slightly larger, double hull version of Patino and Patino 's design was a collaboration with the Dutch and very similar to their Amsterdam class support ships.What I think is more likely to happen is, if the loan/trial of Cantabria is seen as successful, the Government will probably order 'new' builds with whatever modifications are deemed necessary and also have any 'fixes' to the basic design included, which may be necessary as Cantabria is a 'first of class' ship.
I would imagine there are not many "bugs" left to sort apart from the minors.