Norcold Refrigerator Fire

look at way the other wires going to the circuit board are pinched against the metal back of the refrigerator by what is left of the black cover on the circuit board. if the ac power wires were pinched against that metal back and were getting hot enough to melt there insulation or pinched hard enough to cause there insulation to be thin in that spot they could easily short out. are they only protected by the breaker to the ac outlet 15?-20? amp through those smaller wires. now after blowing up the picture looks like the fire started below the black cover where the ac cord connects to the refrigerator was there some kind of a clamp there holding the power cord?