Repair turrets is an objective in the Story Mission, Winging It in Borderlands 2: Commander Lilith and the Fight For Sanctuary
- Head to the Southern exit of the Backburner to the transition to Dahl Abandon.
- Once inside the tunnel section of the Dahl Abandon, go forward over to the right, going up the stairs.
- There, you will find one of the four turrets.
- Move from there to each of the remaining turrets to repair each with just a whack from the Bashwrench to repair them.