I am looking for details of the route: Maps, pictures, waypoints, and a detailed route description. There used to be guided trips into the canyon but the park service doesn't allow it anymore. I have found nothing online and the NP rangers are less than helpful.
The reason why there are no online sources is because there is a real fear that if the canyon were broadbanded the NPS would close it. As far as finding maps, waypoints and a detailed route description, your chances of finding those are extremely slim. You almost have to either go with someone who has already been there or work out the route details yourself (which could take quite a while since the place is a maze).
Sorry if this is bummer news. The good news is that there are thousands of other canyons in the vicinity that are alternate destinations.