Curious, does the 787 have an avionics rack in the ceiling in front of the fin to house one of its two FDR/EAFR's? One in the front of the aircraft and a second at the back somewhere. I notice that's where the 777 FDR lives and thought the 787 could use a similar "survivable" location? If so it simply means electrical equipment lives near where the burn damage evident and this could be related.