Terrorist Theory
Since the question was posed a few hours ago and a terrorist bomb is still a possibility behind the loss of AF447, there was indeed a bomb scare on May 27 in connection with AF415, which was scheduled to depart from SAEZ that evening.
A late morning telephone call received at AF's offices in downtown Buenos Aires stated that the aircraft - which at the time was parked a few hours after completing AF418 - was carrying a bomb. Local police bomb squads performed a throrough search of the aircraft and found nothing, ascribing the episode as nothing more than a bomb hoax. The aircraft was released and it executed AF415 as scheduled.
In retrospect, one is led to think whether these two episodes bear any connection with each other.
Cheers