As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF, WITH ENGINE ANTI-ICE SWITCHES ON, THE MASTER CAUTION AND THE ENGINE NR 1 COWL ANTI-ICE LIGHTS BRIEFLY ILLUMINATED JUST AFTER THE TOGA SWITCH WAS PUSHED. ACFT GROUNDED. REMOVED AND REPLACED THE ENGINE COWL ANTI-ICE VALVE. RAN ENGINE, OPS CHECKED NORMAL. NO LEAKS FOUND IAW AMM 30-21-11.