What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO DFW. ON CLIMBOUT JUST LEVELING OFF FL 340, YELLOW HYDRAULIC PRESSURE LOW ECAM. NO FLUID LOSS PTU CONNECTED NORMALLY. TURNED OFF PUMP OFF PER ECAM. ALL HYDRAULIC SYSTEMS OPERATED NORMALLY. THE AIRCRAFT LANDED SAFELY AT DFW WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND THE ENGINE DRIVEN HYDRAULIC PUMP ON THE #2 ENGINE LEAKING AND REPLACED IT PER AMM 29-13-51. A SATISFACTORY OPERATIONAL / LEAK CHECK WAS ACCOMPLISHED.