What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23)An air carrier aircraft departed the gate and then returned due to mechanical problems. All passengers deplaned from the aircraft during a plane change. While standing in the jetway, waiting for a wheelchair, an 81 year old passenger fell through a space between the jetway and the aircraft to the pavement below. A safety railing normally required to protect against just such an incident was not installed on the jetway at the time of the fall.
As the FAA filed it
(-23)AN AIR CARRIER AIRCRAFT DEPARTED THE GATE AND THEN RETURNED DUE TO MECHANICAL PROBLEMS. ALL PASSENGERS DEPLANED FROM THE AIRCRAFT DURING A PLANE CHANGE. WHILE STANDING IN THE JETWAY, WAITING FOR A WHEELCHAIR, AN 81 YEAR OLD PASSENGER FELL THROUGH A SPACE BETWEEN THE JETWAY AND THE AIRCRAFT TO THE PAVEMENT BELOW. A SAFETY RAILING NORMALLY REQUIRED TO PROTECT AGAINST JUST SUCH AN INCIDENT WAS NOT INSTALLED ON THE JETWAY AT THE TIME OF THE FALL.