Hilariously enough, my YYT-LHR flight last night was grounded by problems that had weren't caused by the famous snowstorms of St John's or any of the issues with the 7M8 that are in the news. Instead the plane was done in by some kind of interaction between the jetbridge and the main cabin door -- when they went to retract the jetbridge, something on the door got broken and it wouldn't seal.
Fin 509 is still sitting at Gate 9 this morning, so I imagine aircraft and jetbridge both are still out of service.
AC 7M8 fin 509, parked at YYT gate 9