As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF ROLL RIGHT REVERSER UNLOCKED AND EICAS MESSAGE DISPLAYED. ABORTED TAKEOFF. UNABLE TO DEPLOY OR STOW RIGHT REVERSER. RIGHT THRUST REVERSER IS DEACTIVATED AND DEFERRED. CLEANED AND LUBRICATED THE 4 BALL SCREW ACTUATORS ON THE THRUST REVERSER ASSEMBLY. OPERATED THE REVERSER SEVERAL TIMES WITH NO PROBLEMS NOTED. RIGHT REVERSER OPS CHECKS GOOD.