I would suggest searching for the Toronto Star's reportage on Air France 358, including their "investigation", and then doing the opposite. There is probably a link buried somewhere in the threads here on pprune, but is probably behind a paywall by now so you'll have to reach for the company credit card.
As has been pointed out above, don't use the word investigation as this will in the mind of the public put you on the same level as the relevant investigative authorities with uncensored access to FDR/CVR etc. etc. etc. when you will not have much more than whatever leaks and chinese whispers are floating around the Aegean.