It turns out that Ferrari don't have to appeal. The fact that the footage has come to light means that the FIA have to investigate and have to reach a conclusion by tomorrow.
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We'll know in 24 hours or so.
The footage looks pretty damning to me, but there is talk of a green flag being waved before the light which isn't visible from the on-car footage. It was there the previous lap, but it's all about whether it was still there on that lap.