Replace all the pipes or repair the defected parts?

[Alex Liu]

Hello, 

I'm going to sell my property in King County WA. I'm doing some major repairs the house and planning to sell it in couple months. One thing I'm not sure about is the pipes. Since I'm going to sell it, just wondering how much of value does it bring if I replace all the pipes vs fixing the broken parts? 

At this point, the 2 shower tubs upstairs are not draining well and they leaks downstairs ceiling. The downstairs bathroom sink does not have water. I have not had a chance to have a plumber look at it yet. Just wandering if anyone had similar situation. 

Thanks！