Spoiler

Odette's Lair: put the 3 devices in the following sequence - do NOT touch them when you have set it, even if you only want to check it. Touching any of the devices after setting a valid combination will reset all the devices and you will have to restart.
 * device E1 --> ELD
 * device H6 --> KEP
 * device A7 --> LUM

These 3 same devices, when they are set correctly, will trigger a lootable Turnapin Cache, which in turn gives you a Turnapin Cache chest that gives you some goodies. The lootable cache disappears as soon as you take the contents.

There are 9 different possibilities to get the chest.