"On Apr 7th the NTSB said the crew recalled receiving an auto-throttle related ECAM message while climbing through 4000 feet shortly followed by an avionics smoke warning with the instruction to land. Despite this message neither crew recalled smelling smoke or fumes during the flight. The captain worked the electronic checklist for the avionics smoke warning, which included shutting down some of the electrical systems. The first officer's display screens went blank, the ECAM messages disappeared, the cockpit to cabin intercom stopped functioning and the air driven generator (RAT) deployed. The captain took control of the aircraft and managed the radios while the first officer opened the cockpit door to advise flight attendants. The crew requested runway 10 but was advised runway 10 was unavailable due to construction vehicles on the runway. The captain was able to use airspeed, altimeter and attitude information during the return to the airport and ordered an evacuation after landing. Cabin crew did not smell smoke or fumes nor did they observe haze, but noticed the cabin lights were turned off and the intercom ceased functioning. Cockpit Voice and Flight Data recorders were downloaded, they both stopped recording prior to landing."
From the updated AvHerald article:http://www.avherald.com/h?article=43a6bc08&opt=0