At 17:07 of the third period in the Penguins/Flyers game, Pittsburgh requested a Coach's Challenge to review whether Sean Couturier interfered with Pittsburgh goaltender Matt Murray prior to his goal.

After reviewing all available replays and consulting with the Referee, the Situation Room confirmed that the incidental contact outside the crease between Couturier and Murray did not constitute a goaltender interference infraction.
Therefore the original call stands - good goal Philadelphia Flyers.
Since the Coach's Challenge did not result in the original call being overturned, the Pittsburgh Penguins forfeit their time-out.