You now have 5 minutes to push 4 buttons. Bug: the timer vanishes after the last switch is activated, however it is still ticking
Up the ramp across from the first pool on the left pillar ( -271, 17, 94 ) /waypoint -271, 17, 94
Left side of the building with the dark elf ( -336, 1, 155 ) /waypoint -336, 1, 155
Half way up the climbable wall right of the first pool ( -306, 9, 174 ) /waypoint -306, 9, 174. Hop off the wall to stand on TOP of the switch to reach it.
On the right side of the building west of the pool ( -99, 13, 73 ) /waypoint -99, 13, 73
Inspect the hidden compartment again
Note : As of 2/14/2015, this guide is out of order at least, with most of the buttons reported not working.
Note2: As of 3/08/2015, They worked for me have to pay attention though 2 of the buttons are close to the other quests buttons.