As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED WHEN ANTI-ICE SYSTEM WAS SELECTED AND HIGH PSI VALVE OPENED A TOXIC ODOR CAME THROUGH THE ENVIRONMENTAL CONTROL SYSTEM AND REMAINED FOR OVER 30 MINUTES. MAINTENANCE INSPECTED AND REPLACED THE NR 1 ENGINE. OPS CHECKED GOOD.