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Welcome to JustAnswer,Open all your taps (as long as someone is in the home). This will relieve some of the pressure on the piping mitigating the possibility of the pipes breaking and will let you know when the pipes thaw out. Heating the entire cold area if possible is more effective unless you can locate a particularly cold spot. Also using an electric hair dryer to thaw the pipes in the coldest area can also help.
Replacing toilet and found lead/iron sewer pipe was