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 SERO. THE AIRCRAFT LANDED AT DFW SAFELY WITHOUT FURTHER INCIDENT AND TAXIED TO THE GATE UNDER ITS OWN POWER. **SUPPLEMENTAL REPORT WILL BE SUBMITTED** (OPEN)