Mar'nah who starts and ends these three quests is located at 51.5, 32.6 on the Isle.

[70] Open for Business [Both]

[70] Discovering Your Roots [Both]

[70] Rediscovering Your Roots [Both]

I was sure we should have data for Mar'nah since I gave Haavok a new set of files with 62000 quest captures last week and I have the new database file from him with all that imported. The coordinate is still 0,0 in the new database and I have verfiied that Mar'nah is in the collected data dozens of times, so it appears we have a database import bug that hopefully Havvok can fix before the next version is released.