Q: Power steering leak

Hey, question..... if you looked at a car and the power steering was leaking and using brake fluid to clean the area if it appeared to be coming from the power steering pressure switch would you recommend only changing that part or would you recommend changing both the switch and the pressure line? I ask because I had a leak and I knew it was the power steering because of the noise... I took it to a shop and they tell me it's the pressure switch so 200$ later it's fixed. I pick up the car, he says no leaks... I get home park it in my stall, put a piece of white card board under it and come out an hour later and there is already a big spot.. it took exactly a week before the noise came back when turning the wheel which is exactly how it was before I took it in. The leak was as if NOTHING was fixed. So I take it back in today and this time they pressure wash it, then look and tell me and show me that it's leaking from the pressure switch which is right next to it.. maybe an inch from it

My car has 17700 miles.
My car has an automatic transmission.