Hey, I haven't seen any posts that detail the locations of the echo logs for the newest dlc, so I'm going ahead and setting it up. I have almost all of them (still need to take screenshots of a few.)
As of right now, these are all of the audio logs for the Backburner and Dahl Abandon (except the secret one in Dahl Abandon.) Note that the Backburner logs and one Dahl Abandon log requires certain quests to be complete (at least I'm absolutely certain of that for the Dahl one.) I tried to refrain from spoilers on characters or anything, but please let me know if I could improve it. Map names appear in the imgur gallery, so don't jump ahead if you don't know where you're going to