What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED INTO MIA DUE TO THE FLIGHT CREW REPORTING THAT ON CLIMB OUT A YELLOW HYDRAULIC RESERVOIR OVERHEAT ECAM DISPLAYED AND THE MESSAGE WENT AWAY ENROUTE. THE FLIGHT CREW REPORTED THAT ON SHORT FINAL TURNED ON YELLOW HYDRAULC PUMP PER ECAM AND AFTER LANDING SAFELY AT MIA THEY REPORTED THAT THE ECAM MESSAGE FOR THE YELLOW HYDRAULIC RESEVOIR OVERHEAT MESSAGE RETURNED - THE FLIGHT CREW TURNED OFF THE YELLOW PUMP - STOPPED AIRCRAFT AND SHUT DOWN. THE AIRCRAFT WAS TOWED TO THE GATE - MAINTENANCE FOUND THR YELLOW ELCTRIC HYDRAULIC PUMP CHECK VALVE 3083GM OBSTRUCTING THE FLUID FLOW AND REPLACED IT - A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO ISSUES NOTED