As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NUMBER 1 ENG THRUST REV AMBER LIGHT FLICKERED DURING TAXI & THEN CAME ON AT START OF ABORTED TAKEOFF ROLL. MAX SPEED LESS THAN 25 KTS. LIGHT EXTINGUISHED AFTER PULLING OFF RUNWAY, RETURNING TO GATE. DEACTIVATED NR 1 ENG REVERSER. FOUND MSG 78001 10 DEGREE SWITCH FAIL. NEED TO TROUBLESHOOT IAW FIM 71-00 TASK 829 831.