What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO PDX DUE TO RECIEVING ENGINE 1 THRUST REVERSER UNLOCK JUST AFTER TAKEOFF. THE FLIGHT CREW ACCOMPLISHED THE ECAM PROCEDURES WHICH INSTRUCTED THEM TO SHUT DOWN THE ENGINE. THE AIRCRAFT LANDED SAFELY AT PDX AND TAXIED TO THE GATE. MAINTENANCE REPLACED #1 ENG INBD THRUST REVERSER UPPER BLOCKER DOOR LATCH IAW AMM 78-31-19, ALSO REPLACED NR 1 ENG INBD THRUST REVERSER UPPER BLOCKER DOOR ACTUATOR IAW AMM 78-31-41. MAINTENANCE ALSO FOUND THE #1 ENGINE THRUST REVERSER HYD CONTROL UNIT DPI EXTENDED / TRIPPED & REPLACED HYD CONTROL UNIT IAW AMM 78-31-51. A SATISFACTORY LEAK & OPS CHECK WAS ACCOMPLISHED.