As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YYC - FLT 0420 - DURING CLIMB OUT, CREW NOTED SMOKE AND FUMES IN MAIN CABIN. EMERGENCY PROCEUDRES WERE ACCOMPLISHED AND RETURNED TO YYC. LANDED YYC WITHOUT INCIDENT. REPLACED RECIRCULATION FAN. SYSTEM GROUND CHECKED, NORMAL OPERATION. (X)