As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. RIGHT ENGINE THRUST REVERSER LIGHT STAYS ON. AC RETURNED TO DFW AS THE RIGHT THRUST REVERSER DEPLOYED INDICATION LIGHT. EMERGENCY WAS DECLARED AND THE AC RETURNED TO DFW. AC LANDED WITHOUT INCIDENT, LANDING WAS NOT OVERWEIGHT. TIGHTEN AND CLEANED THRUST REVERSER SWITCH ON RIGHT HAND ENGINE OPERATIONS AND LEAK CHECK GOOD PER AMM 78-32-02.