As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF ROLL, THE NR 3 ENGINE THRUST REVERSER UNLOCK LIGHT ILLUMINATED. THE TAKEOFF WAS ABORTED AT 70 KTS WITH THE INDICATION EXTINGUISHING WITH POWER REDUCTION. MAINTENANCE PLACED THE REVERSER ON MEL 78-1A AND THE AIRCRAFT RETURNED TO SERVICE.