As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REJECTED TAKEOFF FOR A RT THRUST REV UNSAFE CAUTION MESSAGE AT THE VERY BEGINNING OF THE TAKEOFF ROLL, LESS THAN 10 KNOTS. AIRCRAFT EXITED THE RUNWAY WITHOUT ISSUE AND RETURNED TO GATE WHERE MAINTENANCE HAS BEEN CALLED TO INSPECT AND TO POTENTIALLY DEFER THE RT THRUST REVERSER.