Hard data
I imagine they are responding to some political as well as industry pressure but also trying to get all of their ducks in a row for the investigation. Every scrap of Mx, crew training, ops manual, everything. I do not understand a partial non transcript release unless some one said "just give me something to keep them off our backs for a bit". I would find it hard to believe that the data they had did not tell them the bird was down.
I saw a note above about two sources of lightning data. I'll dig into the NASA site tonight to see what data they have.