At 19:33 of the third period in the Capitals/Bruins game, the Situation Room initiated a review under the terms of a Coach's Challenge to review whether a Boston player interfered with Washington goaltender Braden Holtby prior to Patrice Bergeron's goal.

After reviewing all available replays and consulting with NHL Hockey Operations staff, the Referee confirmed no goaltender interference infractions occurred before the puck crossed the goal line.
Therefore the original call stands - good goal Boston Bruins.