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 ENGINE INBOARD THRUST REVERSER UPPER BLOCKER DOOR LATCH PER AMM 78-31-19, ALSO REPLACED THE #1 ENGINE INBOARD THRUST REVERSER UPPER BLOCKER DOOR ACTUATOR PER AMM 78-31-41. MAINTENANCE ALSO FOUND THE #1 ENGINE THRUST REVERSER HYDRAULIC CONTROL UNIT DPI EXTENDED / TRIPPED AND REPLACED THE HYDRAULIC CONTROL UNIT PER AMM 78-31-51. A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED.