As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) FLIGHT CREW ADVISED ON CLIMBOUT OF DEPARTURE POINT, THE LT COWL ANTI-ICE VALVE FAILED TO OPEN. AFTER SEVERAL ATTEMPTS TO GET VALVE TO OPEN, FLIGHT RETURNED TO THE DEPARTURE POINT. MAINTENANCE ACTION HAD THE ANTI-ICE VALVE REPLACED AND THE ACFT RETURNED TO SERVICE.