Repair Existing excel Business Workbook/ not a rebuild

I am looking for an experienced Microsoft Excel developer to assess and repair an existing business workbook called LIOS (LiquirigS Intelligent Operating System). This workbook has been developed over several years and is used daily to run key parts of my business. I am not looking for a new system or a complete rebuild. My objective is to repair and preserve the existing workbook wherever possible. The workbook appears to function correctly in most areas. However, I believe there is a fault wi…