When preauthorization for major repair crosses several steps, aftersales manager and warranty administrator should use one shared record. Note the warranty policy date and version with the diagnostic order, the photos, and the approval record, and review the diagnosis, authorization, parts, and labor behind preauthorization for major repair against the policy. Link preauthorization for major repair to VIN, claim, failure date, and policy version in the acceptance sheet rather than using only a model or project name. Before closing preauthorization for major repair, review the corresponding import checklist. For a first batch or a high-risk unit, at least 2 independent checks on preauthorization for major repair should cite the same VIN, claim, failure date, and policy version. Keep the claim pending while evidence is incomplete and settle only after approval is documented; do not give the customer a scope answer in advance. After a change, reopen only the record for preauthorization for major repair and preserve approved decisions on other warranty operations items.