As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON APPLICATION OF TAKEOFF POWER, THE NR 3 ENGINE REVERSER UNLOCK LIGHT ILLUMINATED. THE TAKEOFF WAS ABORTED AND THE AIRCRAFT RETURNED TO THE GATE. MAINTENANCE ADJUSTED THE REVERSER VENT VALVE RIGGING AND FOUND ALL INDICATIONS NORMAL. AIRCRAFT DEPARTED WITHOUT FURTHER PROBLEMS.