What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) A/c electrical power was on and crew was getting ready to start a/c engines when the flight engineer smelled and then saw smoke coming up through the air vents. Lights on the engineer panels started to blink. Crew evacuated all passengers from the cabin. Emergency fire crews were alerted by the ryan international mechanic and arrived on the scene in a few minutes. By the time the crew arrived there was substantial smoke coming out of the lower compartment. They quickly doused the flame with halon and then disconnected the battery.
As the FAA filed it
(-23) A/C ELECTRICAL POWER WAS ON AND CREW WAS GETTING READY TO START A/C ENGINES WHEN THE FLIGHT ENGINEER SMELLED AND THEN SAW SMOKE COMING UP THROUGH THE AIR VENTS. LIGHTS ON THE ENGINEER PANELS STARTED TO BLINK. CREW EVACUATED ALL PASSENGERS FROM THE CABIN. EMERGENCY FIRE CREWS WERE ALERTED BY THE RYAN INTERNATIONAL MECHANIC AND ARRIVED ON THE SCENE IN A FEW MINUTES. BY THE TIME THE CREW ARRIVED THERE WAS SUBSTANTIAL SMOKE COMING OUT OF THE LOWER COMPARTMENT. THEY QUICKLY DOUSED THE FLAME WITH HALON AND THEN DISCONNECTED THE BATTERY.