As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF ROLL THE FLEX SETTING ON THE NR 1 ENGINE WAS LOST. THE CREW ABORTED THE TAKEOFF AND RETURNED TO THE GATE. THE FLEX SYSTEM WAS OPERATIONALLY CHECKED IAW CRJ 700 AMM 71-00-00-710-803-A01. THE SYSTEM OPS CHECKED GOOD. THE AIRCRAFT WAS RELEASED FOR SERVICE.