As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER DEPARTURE, THRUST REVERSER ISOLATION VALVE LIGHT ILLUMINATED. AIRCRAFT RETURNED TO HOU AND MADE AN UNEVENTFUL LANDING. REPLACED BOTH ISOLATION PRESSURE SWITCHES AND T/R ISOLATION MODULE. LEAK AND OPS CHECKED NORMAL PER BOEING MM.