How do you arrest water leakage in concrete roof slab?

I would hire a leak detection company first. They should be able to pinpoint the leak to within 1 foot. A leak detection company is not always a plumber, but they can be. Ask them. Use someone like United Leak Detection or American leak detection Than I would consider either jackhammering thru the floor and fix the pipe, or bypassing all that and just run new lines thru the walls and or attic. If you are in a warm climate this can be a better option for you. In cold climates, you need to have a second story so that freezing is not a problem. Problem is that your leak might just be the first one of many to come. Thus therefore, I would recommend just bypassing all the jackhammering and such, and just have the plumber run new lines.

So my answer is: run new lines thru the walls or attic. Unless you can't then you won't.