The first one is in the Trial of Kabr, to the right as you enter. Look for the red light.
The second one is in the hidden path to the Templar secret chest for keeping him from teleporting. Look for an upper ledge as you descend. The area will be well lit. I believe this one will load the Gorgon's Labyrinth and then it will spawn.
The third is in a cave on the left as you enter the descent to Atheon. Go left, and you'll come out overlooking the vex gate. Drop down directly below you and some way down there's a ledge that leads to a small cave ending the chain. The hidden platforms will begin teleporting in and out and the unused Vex gate will open leading to the secret boss and Praedyth's Ghost. This one was conspired to be the cave the 6th chest was in.
Good luck guardians!
Edit: Turning in Praedyth's ghost did not lead to a quest. There may be a hidden timer or trigger that leads to the quest line.
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I call bull shit I took this way last week and didn't see anything