Lehkonen tied it 2-2 at 14:22 by knocking a loose puck between Demko's pads from the top of the crease. Lehkonen has scored eight points (six goals, two assists) during a five-game point streak.
"I feel like I've always had chances. Sometimes it doesn't go in and now it's been going in," Lehkonen said. "I try and find the open space and Jake and 'Remy' made some heck of a plays to me today and I got a couple of good shots off."
Pettersson made it 4-2 at 8:53 of the third period on a solo power-play rush. Vancouver finished 2-for-4 on the power play while blanking the Canadiens on four chances with the man advantage.
"It wasn't a Picasso," Boudreau said. "We didn't play a great game, but we played hard, and we answered the bell. When they scored, we came back and scored. Our special teams, which a lot of times this year has been really skewered for lack of production, we won that battle and that was the difference in the game."