No, there is not. The moderation log is only visible by other moderators (of that subreddit, you can't gain access to modlogs of subs you don't mod.)
Spez (CEO) was literally editing comments and the only definitive proof is that he owned up to it
They also edited the voting algorithm for the_donald subreddit to suppress its content and the only way we know that is because they fucked it up on the first try and made the entire frontpage ONLY TD content for an hour or more.