As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHX - IAH - FLT 274 - THE CREW REPORTED THE A/C LOST GREEN HYDRAULIC SYSTEM WHICH RENDERS NOSE WHEEL STEERING INOP. THE CREW DECLARED AN EMERGENCY. THE LANDING WAS UNEVENTFUL AND THE A/C WAS TOWED TO THE GATE. MX REPLACED THE NR 1 ENGINE HCU DIFFERENTIAL PRESSURE HOUSING O-RING. OPERATIONAL / LEAK CHECK WAS GOOD. THE A/C WAS RETURNED TO SERVICE.