ULB Battery Due Date
Just on CNN:
The MAS CEO declared during a press conference that the FDR / CVR - ULB maintenance records indicate that the ULB battery due date is June 2014.
That would imply that these batteries should have been replaced during scheduled maintenance in an A-check at around this time or in the next month or so if the aircraft was still in service to avoid the battery expiring between scheduled maintenance intervals.