As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. EMERGENCY DECLARED. JFK-GRU FLIGHT RETURNED TO JFK. OVERWEIGHT LANDING UNEVENTFUL. LEFT ENGINE ANTI-ICE INDICATION OF VALVE STUCK IN CLOSED POSITION. REMOVED AND REPLACED LEFT ENGINE ANTI-ICE VALVE IAW AMM 30-21-02 (AALA20170121002) AND LEFT ENGINE ANTI-ICE CONTROLLER IAW AMM 30-21-03. OPERATIONAL CHECK GOOD.