As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON CLIMB OUT RECEIVED WING OVHT WARNING MESSAGE ON LEFT WING, RAN QRH, MSG DID NOT CLEAR, RETURNED TO FIELD, AFTER LANDING RECEIVED ANTI-ICE DUCT WARNING MSG. CORRECTIVE ACTION: REMOVED AND REPLACED APU CHECK VALVE PER 36-19-03. (TC# 20190617014)