What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO DFW, DURING CLIMB OUT ENGINE #1 THRUST REVERSER FAULT MESSAGE DISPLAYED. THE AIRCRAFT LANDED SAFELY AT DFW WITHOUT FURTHER INCIDENT AND TAXIED TO THE GATE UNDER ITS OWN POWER. MAINTENANCE FOUND THE #1 ENGINE THRUST REVERSER HYDRAULIC CONTROL UNIT FILTER CLOGGED INDICATOR WAS POPPED AND REPLACED THE FILTER PER AMM 78-31-51. (AALA202305044356). MAINTENANCE ALSO ADJUSTED THE #1 ENGINE INBOARD THRUST REVERSER LOCKING ACTUATOR PROXIMITY SWITCH PER AMM 78-31-15. (AALA202305047124) A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED.