Sooner or later you'll come to the quest area "Farnel Research Facility" on planet Balmorra. It is the most North part of the zone.
You'll come to the object, Space Chest, at the other side of the bridge (you can't cross it though cause it is broken) with the "quest" mark. You'll click on it but it says "Key is required...".

WTF! I've spent like 30 mins killing trash mobs around dreaming they'll drop the key, but no luck.
I came back to the base to sell grey items and selected to show "vendors" on the map. And I've noticed the one at rather unusual location.

His name is Ba'teil, he sells some stims and medpacks but he also sells "Code Cylinders". "Lost Code Cylinder" description was almost explicit though the price was high.

Nevertheless, I bought it for 5k, went back to Space Chest and...

used it on that Space Chest:

It opened and contained Datacrons that gives you +4 to Willpower, just click on it:

Chest remains open for like 3 mins and seems like other players can loot it and get it...
Gratz - you just discovered something in SWTOR! More about Datacrons could be found here.