What are the grounds for a replay?

[BigJ]

If they formalize the procedure for replays more I'd like to see an option for the offended team (if problems affect only one alliance or robot) to decline the replay (Much like coaches can decline a penalty call in American football if the non-penalized field position / down is more advantageous).

I can remember at least one match in 1675's history where we won and had to replay because of a field fault involving the communications of one of our alliance members. We won the replay if I remember correctly, but I don't think a replay is necessary there.