I would think that if you can take a couple of pictures of the crack and the failed repair to send to GD, that would go a long way to getting satisfaction. And, I would not go and ask about a defective tank, I would just get hold of them, let them know what the problem and ask if you can send some pictures of the problem to se if they will replace the tank. If you go in and tell them, or ask them, why a defective tank was allowed to leave the factory, they will get their back up, probably, and be a little less than helpful.
