You basically need to track down what the guide is in the guides forum manually.
Typically you can find it by getting the guide name, going to the search deal and picking "advanced search", putting the guide name in for the search terms and telling it to only search the player guides forum.
There's no way to easily fix it as all the thread IDs got changed when they did the migration
Yep, it's going to be a trial to edit all those links.
Yeah, I cant imagine that'd be a fun job.
But, thanks guys 
Seven years of heroism. Seven years of friendships. Seven years of saving the world. Seven years of virtuous selflessness.
You will return, for you are the mighty City of Paragon, the City of Heroes.
So, since the transition to the new boards, it's been impossible for me to view player guides from before the Forumocalypse.
Anyone know the issue/how to fix it?
Seven years of heroism. Seven years of friendships. Seven years of saving the world. Seven years of virtuous selflessness.
You will return, for you are the mighty City of Paragon, the City of Heroes.