It looks like the batteries have been dropped, the opening in the gray area below the "crew" door.
The hydraulic res is visibile behind the F/Os seat with scorching at the bottom. The hand pump, gear lever and flap lever would have plenty of 5606 under pressure by the F/Os seat along with the cowl flap selectors on the side wall. The fuel pressure gauge would have gas under pressure going to the instrument panel and the oil pressure gauge has 5606 in it, also under pressure. Lots of fuel once the fire starts, what started it will be interesting.