What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO DFW DUE TO THE FLIGHT CREW REPORTED ON CLIMB OUT, THEY NOTICED HOT AIR BLOWING INTO THE FLIGHT DECK. PACK SHOWED NORMAL, BUT NO PRESSURE FROM ENGINE ONE. NO ECAM ALERTS OR INDICATIONS OTHER THAN 0 PSI ON BLEED PAGE FOR ENGINE 1. THE AIRCRAFT LANDED SAFELY AT DFW WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND A SENSE LINE SEVERED ON THE #1 ENGINE AND REPLACED THE SENSE LINE PER AMM 36-11-49. A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED.