Here's what I would do. If possible, fold the entire top (front section) back down as though you were putting it away. At this point, make sure it is fully-smushed. This should allow the mechanism to re-hook itself.
Then try normal pull-up technique -- I make sure the back comes up still folded, as the front starts to extend. Then, I put down the case and pull apart the back fold... On mine, it is then the back latch first, then the front ones. Good luck.
James
63 230SL