Our 777's have a F/A crew rest in that location, the Pilot crew rest is up top too but up front, overhead the F/C area. Not sure if some of the 787's have the same layout, but it would not surprise me if that was where the F/A crew rest area is, since it is on the 777.

Might have been a wiring issue with all the reading lights up there. Funny no 777's have had that type of fire...yet...that we know of.

On some of our 767ER's, they have just added a below floor (cargo area) crew rest box, do any of the 787's have that type?