Electrical fire
What type of electrical fire is severe enough to cause the failures on this flight, incapitate the crew, yet allow continued flight for 7 hours?
Smoke and or fumes could overcome the crew, if they failed to use the oxy masks,( or if oxy bottles inadvertently filled with nitrogen) however, the way I see it any type of fire that caused the aledged defects would certainly not allow continued flight.
IMHO, it is very likely that continued human intervention is most likely.