QThe exterior (garden) pipes at my house froze. Now what? I turned off the main to the exterior garden, then used a brief warming period to thaw the pipes enough so I could open the spigots and allow the thawed water to flow out. But if any pipes were broken, they will leak when I turn the exterior main back on. How do I identify potential leak points and minimize damage? In the worst case, what has to be done to fix broken pipes?