Tassiter wants you to inspect the quarantined section of the Veins of Helios to see if some infestation thing is the real deal. When you get to the large, open area in Veins of Helios, you want to get to the Central Maintenance section (you go here during the story mission). Use the airlock to get inside and move to the third room in this section.

Here, you will see three markers on your map, which corresponds to three consoles you need to interact with in the room. You will need to press them in a correct order, else you will fail. Luckily, you can restart the mission via a console in the same room, so you won’t need to go all the way back to Jack’s office to restart.

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You’ll need to hit the three consoles in the correct order (left), then you will have to hit five buttons to activate force fields (right).

The first console is the one near where you entered the room, with the second being opposite that first one. With those two pressed, activate the third console opposite the entrance to the room to move on to the timed section of the mission. You have to press five buttons within 30 seconds or else you will fail.

There are two buttons on each side of the catwalks at the top of the room and one more underneath the opposite catwalk from the entrance. It might be best to start with the lower one, then go up top and hit both on one side, jump and boost to the other side for the last two. Once you manage to get all five, go to the marked console to release the worker bots, which is the end of the mission.