As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW NOTED THAT AFTER LANDING THE LT THRUST REVERSER SEEMED SLOW TO DEPLOY: REMOVED ISOLATION VALVE DUE TO LT T/R SLOW TO DEPLOY. REMOVED THRUST REVERSER LOCKOUT PINS AND ENABLED THE THRUST REVERSER SYS. THRUST REVERSER SYS OPS CHECK AND LEAK CHECK GOOD IAW MM 78-31-00.