As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. LEFT COWL ANTI-ICE AMBER LIGHT ILLUMINATED ON TAKEOFF ROLL, CREW REJECTED TAKEOFF AT APPROX 50 KNOTS. LIGHT WENT OUT AS THRUST LEVERS WERE PULLED TO IDLE. REPLACED NR 1 ENGINE TAI PRESSURE SENSOR, IAW AMM 30-21-21 AND COWL TAI VALVE (AALA202101029015) IAW AMM 30-21-11. LEAK AND OPERATIONS CHECK GOOD.