What was found
PHX - EMERGENCY LANDING - FLT 0614 - AFTER TAKEOFF PHX EN ROUTE FOR ATL, PILOT REPORTED THAT A GREEN RESERVOIR OVERHEAT ECAM MESSAGE APPEARED. PILOT FOLLOWED ECAM DIRECTIONS, HOWEVER WAS UNABLE TO RESTORE GREEN SYSTEM PRESSURE. MAINTENANCE REMOVED AND REPLACED NO. 1 ENGINE GREEN SYSTEM ENGINE DRIVEN HYDRAULIC PUMP PER AMM 29-11-51-401. OPERATIONAL AND LEAK CHECK WAS FOUND TO BE GOOD. VENDOR TEARDOWN OF HYDRAULIC PUMP S/N MX611108 COULD NOT VERIFY REASON FOR REMOVAL. THERE WERE NO INDICATIONS THAT PUMP CAUSED HYDRAULIC SYSTEM FAILURE. UNIT WAS FOUND TO HAVE WORN SEALS, AND ALSO REQUIRED LAPPING OF PISTONS, WEAR PLATE, AND CYLINDER BLOCK DUE TO NORMAL SCORING, ALL CLEARANCES WERE WITHIN LIMITS.