The NHL is investigating why the Pittsburgh Penguins' TV-rights holder withheld from replay officials a videotape that showed the Flyers' Simon Gagne scoring a shorthanded goal against the host Penguins. The replays that were provided were not conclusive unlike the replay that was withheld.

Link:
NHL investigating withholding of tape of Flyer's goal | Philadelphia Inquirer | 01/12/2010