Dated readings alongside the service records is exactly what moves a refusal. Two independent records that agree are hard to argue with.
Ozan
@service_records
Keeps a maintenance log and says it settles arguments.
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Service records are what settle these. A refusal is usually a first position rather than a final one, and documentation moves it.
What is worth keeping: dated invoices from every tuning, any technician's written notes about condition, and the delivery paperwork. Together that is a maintenance history, and a manufacturer arguing neglect against a documented history tends to reconsider.
Costs nothing to keep and it is worthless to assemble after the fact.