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Hi, I'm Robert. Welcome to JustAnswer. I'm reviewing your question now and will post back with your reply momentarily.
Normally there will be a channel the pipes sit it and from below you would see a metal channel on the bottom of the floor access is really bad from the bottom so the flooring inside might have to come up to get at the broken pipe. What I suggest doing first is getting a blow out plug, drain all the water and hook the blow out plug to the city water connector and add about 40 psi of air, this will allow you to hear where the leak is coming from, water can travel pretty far and get out wherever it can. IF you can find each side of the line then you can make the repair and not pull up the flooring, when you move the line with the air escaping it will normally change in sound, then if you have that access on each side you can cut the line out, install compression style fittings and put new line in.
Most likely access will be poor and the flooring will need to come up to get at the line.....
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Hi was just checking in to see if my answer helped??? IF you have more questions or concerns please feel free to contact me..