Seems we have several modes to consider here.
Normal, Emergency, and whatever the rrew had to operate with because the electrical fire and its effects.
I am understanding the ECL's in "Normal" do not effect engine power settings as they are moved from FLY (or whatever the postion is called) but acts like a Fuel Shutoff and engine control is by means of Beep Trim Switches.
In EMERGENCY they do control Engine Power Settings and can be modulated by movement all the way back to the Fuel Cutoff position.
Now the rub comes when Switches like both GENS, BAT MAIN and BAT Master get moved to the OFF position......I remain unclear as to what happens then re Engine Control.
Finally.....we do not know what effect the Electrical fire had in any or all of the above.
Am I getting this right......you 139 guys set me straight if I still do not have it right.