Star Wars Knights of the Old Republic II: The Sith Lords/Fuel Depot

Harbinger Engine Deck
You enter the at the southeast end of the fuel line. You can return to the Harbinger engine deck behind you.

Fuel Line to Harbinger
You see T3-M4 ahead of you in the fuel line to the northeast. As you approach, Atton speaks.

Rescue T3-M4

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Just before the northeast end of the fuel line, there's a concealed stash.

Just beyond this is an in front of the door on the right in the southeast wall.