Wouldn't suprise me, reminds me of the one in Hong Kong that they noticed fuel leaking out of a wing, close inspection revealed a couple of inch crack in the lower wing skin, now these skins are rolled so all the metal grain runs in one direction for strength I believe, which means the crack can rapidly open like a zip...... so what did they do, they flew it back to the UK!!
BTW MAMS are movers and would be PAX not crew.