AM say the pump broke.. if they can be allowed to (with FIA supervision) replace pump, they may well succeed in appeal
That's pretty convenient that the pump broke on the day they are suspected to be under-fuelled, especially given Vettel was immediately told to stop the car on track as soon as he crossed the line as if they knew they had run out of fuel. If it was just a case of the team replacing the pump under supervision, why not do it at the time, not say they could have done it a few days later?
Rules like this are pretty cut and dried, coming up with excuses after the fact shouldn't get the team anywhere. It's not a question of what they say they had in the tank, or what they could/might have done, it's purely "did you supply the sample as and when requested", and the answer to that remains a resounding "no".