Line system Power steering

Hello community, I have a Phaeton 3.0 TDI Model 2005 and 2 days ago the front left directly at the edge of the shock rod is located a medium large spot oil. Today we removed the cover inside wheelwheel and found that one of the steel cables from the power steering has a crack because of rust. My question now, there is a Rep Kit or really has to out the whole line, which will be an immense effort. On the one picture it is the outer line above. No for your answer.