At 11:41 of the first period in the Maple Leafs/Canadiens game, Toronto requested a Coach's Challenge to review whether Montreal's Ryan Poehling interfered with goaltender Frederik Andersen prior to his goal.
After reviewing all available replays and consulting with the Referees, the Situation Room determined that the actions of Toronto's Frederik Gauthier caused Poehling to contact Andersen before the puck crossed the goal line. The decision was made in accordance with Note 2 of Rule 78.7 (ii) which states, in part, that the goal should be allowed because "the attacking Player was pushed, shoved or fouled by a defending Player causing the attacking Player to come into contact with the goalkeeper."
Therefore the original call stands - good goal Montreal Canadiens.
Since the Coach's Challenge did not result in the original call being overturned, the Toronto Maple Leafs forfeit their time-out.