bearfoil & BOAC
Like Rolls Royce, GE has a real time engine monitoring program called "On Point." The CF6-80E engines on AF447 were being monitored with data being fed to both GE & AF. As the BEA Interim Report states:
The engines were subject to real-time monitoring in the framework of the engine condition monitoring program. Examination of the data recorded, including the data transmitted on the day of the accident, shows that both engines were functioning normally.
This data is another part of the mosaic. I would suspect the BEA has more relevant data from this source beyond their disclosed comment. For example, they may know the power settings at the time of the incident, how they may have changed by input from the A/P or pilots and exactly when the settings changed. They probably have overlaid this data overtop of the ACARS to gain insight as to what was happening and when.