I'm in Michigan, with DTE Energy gas service. I had an experience a decade ago where they came to the door and informed me that the line needed to be replaced d

I'm in Michigan, with DTE Energy gas service. I had an experience a decade ago where they came to the door and informed me that the line needed to be replaced due to a leak. That made me pretty worried, but their nonchalant attitude seemed to indicate that it wasn't a big deal. Turns out (if I understood and remember it properly) that it was a small leak that was known about for some time—it was probably detected by a vehicle that drives around with sensors mapping out leaks. Both that house and the one I own now are over 100 years old. The water, sewer, and gas lines are, AFAIK, original.