As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO DFW DUE TO A YELLOW HYDRAULIC SYSTEM RESERVOIR LOW LEVEL WARNING DURING CLIMB OUT AND THE YELLOW HYDRAULIC SYSTEM QUANTITY WENT TO ZERO. THE AIRCRAFT LANDED AT DFW SAFELY WITHOUT FURTHER INCIDENT AND TAXIED TO THE GATE UNDER ITS OWN POWER. **SUPPLEMENTAL REPORT FOR AALA202303242649: MAINTENANCE FOUND HYDRAULIC LINE IN #2 PYLON LEAKING AND REPLACED IT. A SATISFACTORY LEAK/ OPERATIONAL CHECK WAS ACCOMPLISHED. ** (CLOSED)