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All conductors and bonding should be regularly inspected and maintained by a Lightning Professional. Degradation of the grounding electrode over time by moisture and soil conditions is not something that can be visually checked, a high potential dielectric test set must be used. Any changes to the structure after installation of the protection system should be followed up with inspections of the modifications and an update to the protection system.
You can find more information on lightning protection from the following web resources.