As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD FLT 6029 THE CREW REPORTED A WING ANTI-ICE FAIL MESSAGE ON CLIMB. THE AIRCRAFT RETURNED TO ORD AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE NR 1 OUTLET DUCT ASSEMBLY ON THE ENVIRONMENTAL CONTROL UNIT. OPERATIONAL CHECKS WERE GOOD.