The things I'd like to know are;
a) A transcript of RT from the start of the first approach. (esp. was RVR/vis passed at values below minima for an approach to commence/continue & was Wx for diversions passed)
b) TAFs and METARS for relevant stations as available at the time of their departure.
c) Fuel on board at departure.
d) The crew's duty records for the previous week or so.
e) Maintenance standards for that particular fleet, and I mean subjective opinion from company pilots, not fudgeable paper records. (Having experienced appalling standards in similarly sized aircraft in the past that could easily have resulted in an accident such as this)