What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT DIVERTED TO DFW DUE TO THE FLIGHT CREW REPORTING AN ANTI ICE ENGINE 1 VALVE CLOSED ECAM CLIMBING THROUGH FL250. ECAM GOES AWAY WHEN ANTI ICE PUSH BUTTON IS OFF. THE AIRCRAFT LANDED SAFELY AT DFW WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND PRSOV #1 VALVE HAD A LOOSE SENSE LINE AND WAS MISSING A CLAMP. MAINTENANCE SECURED THE SENSE LINE (AALA202602232696) AND INSTALLED THE CLAMP (AALA202602237273) PER AMM 36-11-52. A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED WITH NOS ISSUES NOTED.