As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. DURING TAKEOFF THE MASTER CAUTION ILLUMINATED ACCOMPANIED BY THE ANTI-ICE LIGHT. ABORTED TAKEOFF AT APPROXIMATELY 20 KNOTS. ACCOMPLISHED FIM TASK 30-21-00-810-809. REMOVED AND REPLACED NR 1 ENGINE THERMAL ANTI ICE VALVE IAW AMM 30-21-11. SYSTEM CHECKS NORMAL.