Here are some examples where defects have been found.

corroded supply heating duct
corroded supply heating duct

compromised corroded supply heating duct

non-insulated ducting in attic
non-insulated ducting in attic

ducting in non-conditioned spaces needs to be insulated and properly secured

reversed polarity
reversed polarity

The electrical tester shows that the outlet is wired with the hot and neutral wires reversed.

corroded supply heating duct
corroded supply heating duct

compromised corroded supply heating duct

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