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 DURE TO THE FLIGHT CREW REPORTING BLEED VALVE #1 INOPERATIVE. THE AIRCRAFT LANDED SAFELY AT DFW WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED PRESSURE REGULATOR VALVE SOLENOID 10HA1 AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 36-11-55.