Guy Norris got more information on the possible ignition source of the fire in the P100 panel on board ZA002. An electrical contactor which helps distribute power from the engines. There are two of these contactors. One was discovered melted while the other suffered extensive damage.
Another bit of news is that the insulation between the fuselage and the P100 power panel was charred and had been effective in protecting the composite skin of the fuselage. This has been a point of debate in some circles and now apparently the insulation did protect the fuselage as it was meant to do. This should give Boeing and the FAA some comfort.
You can read Guy's post:
Guy Norris: Mid-2011 delivery for delayed 787?