As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 1873 - ON TAXI OUT FROM GATE, SMOKE AND FUMES NOTED IN PASSENGER CABIN WITH HYDRAULIC QTY DECREASING. PASSENGERS AND CREW EVACUATED WITHOUT INCIDENT. RETORQUED B-NUT AT LEFT THRUST REVERSER HYDRAULIC VALVE FITTING. PERFORMED AIR CONDITIONING PACK BURNOUT PER MM. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)