As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LANDING, THE NR 3 ENGINE THRUST REVERSER DID NOT COME OUT OF REVERSE THRUST. THE ENGINE WAS SHUT DOWN AFTER CLEARING THE RUNWAY. MAINTENANCE LOCKED OUT NR 3 THRUST REVERSER PER MEL 78-1A. EXACT PART CAUSING PROBLEM TO BE DETERMINED.