As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CREW REPORTED CENTER SYSTEM HYDRAULIC AIR DRIVEN PUMP FAILED INFLIGHT. NO FLUID LOSS REPORTED. EMERGENCY DECLARED FLIGHT RETURNED DFW LANDED WITHOUT INCIDENT. PLACARD AIR DRIVEN PUMP INOPERATIVE PER MEL. REPLACED ADP AT JFK ON 07/26/2011. SYSTEM GROUND CHECK NORMAL OPERATION.