What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23)Aircraft was parked in holding gate 18R for indefinite weather delay. Aircraft was getting very warm. APU and #1 HP bleed valve inoperative. Flight attendant asked captain if they could open rear (1-2) door to get some relief. Flight attendant privacy data omitted opended door and forgot to disarm the door. Causing slide to deploy. Aircraft taxied back to gate.
As the FAA filed it
(-23)AIRCRAFT WAS PARKED IN HOLDING GATE 18R FOR INDEFINITE WEATHER DELAY. AIRCRAFT WAS GETTING VERY WARM. APU AND #1 HP BLEED VALVE INOPERATIVE. FLIGHT ATTENDANT ASKED CAPTAIN IF THEY COULD OPEN REAR (1-2) DOOR TO GET SOME RELIEF. FLIGHT ATTENDANT ^PRIVACY DATA OMITTED^ OPENDED DOOR AND FORGOT TO DISARM THE DOOR. CAUSING SLIDE TO DEPLOY. AIRCRAFT TAXIED BACK TO GATE.