Did NZ have damage to their first wing that they changed out earlier? . . . 'cause they're gonna need it.
I don't think they ever said why they had to change it. The announcers probably didn't know.
The wing looked structurally, they might be able to replace the lost foam and stretch some new heat shrink and be good to go.
The real question is how on earth did NZL manage to make a mistake like that, they have been a machine.