You can report a fence problem even when earlier paperwork is missing. Give the property address, the symptoms and what you know about alterations. Ask the electrician to explain the defects found, the proposed repairs and whether another trade must first attend to the supporting structure. If the inspection cannot cover a section, keep that limitation and the next access step in the work record.
After corrections, retain the work description and inspection documents with the property file. Keep older certificates and plans intact so the next owner can follow the changes. A historical drawing can support that record, but it does not replace inspection and testing of the current fence. If optional improvements are proposed, distinguish them from the work needed to address the reported defects.