As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YEG - CREW COULD NOT OPEN MAIN CABIN DOOR VIA NORMAL OR EMERGENCY MODE FROM INSIDE. DOOR OPERATION WAS NORMAL FROM EXTERIOR. LOCK MECHANISM FOUND FROZEN. FREED UPLOCK MECHANISM WITH HEAT AND LUBE WITH SILICONE SPRAY. MCD OPS CHECKED GOOD.