Pilot...An electrical fire actually answers your questions quite nicely. What would be the first thing you would do if you were running your microwave and it began to spark? Would you make a distress call to the fire department? Of course not. You would shut the microwave off.
If there was an electrical fire, they would immediately turn all those systems off to try and isolate and stop the fire thus causing those systems to be turned off and communications to be cut off. Once the fire is under control you would then systematically begin to turn things back on and make whatever distress call you're going to make. Obviously they never made it to that point - probably because they were asphyxiated and died along with everybody else on board.
Navigate...There's no evidence that the left hand turn was pre-programmed. In fact the evidence points to it being hastily done. To me that seems like something one of the pilots would do in an emergency situation to turn the aircraft towards the nearest landable airstrip.
Communicate, which did not happen.
Though the wife and kids moving out is an interesting twist and certainly questions the mental health of one of the pilots.