A long time ago an MD82 crashed at Madrid but even with CVR's and FDR's recovered nobody knows what happened. Why?
Maybe it is time to release this information to the public.
FDR and CVR were certainly screened for systematic failures days ago. If indications of a systematic mechanical or electrical failure had been found the MD operators would have been alerted by an all operator telex. As this is not the case until now such failure may not have been found.