As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) SHORTLY AFTER DEPARTURE THE FLIGHT CREW RECEIVED AN ANTI-ICE DUCT WARNING MESSAGE, THE LT FUSELAGE FLOW BAR WAS RED. AS THERE WERE ICING CONDITIONS ENROUTE, THEY RETURNED TO YYZ. MTC INVESTIGATION FOUND SENSE ELEMENT A15WK CRACKED AND SHORTING TO GROUND. THE ELEMENT, P/N 35586-2-255, WAS REPLACED. A/C TSN 15106, CSN 12011.