I am assuming that you have a gas furnace or water heater, and the leak is around this pipe, in this case I would go with a roofer. If this is not the case you may need to look in the attic to see where the leak is coming from. We do not have gas, and there are no pipes in the furnace room that go through the roof.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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