# 维修服务验证 / Repair service validation

1. 产品、市场、故障类型 / Product, market, failure type
2. 诊断负责人、工具、说明和软件支持 / Diagnostic owner, tools, information and software support
3. 零件库存、价格、供货时间 / Parts stock, price and lead time
4. 成功、失败、再次故障和保修责任 / Success, failure, recurrence and warranty terms
5. 客户总支出、停机、剩余寿命 / Customer outlay, downtime, remaining life
6. 品牌另算库存、工时、物流、重复维修 / Brand separately accounts for inventory, labour, logistics and repeat repairs

模型 / Model: expected cash=C+(1−p)R; avoided immediate cash=pR−C; break-even p=C/R (R>0). All attempt costs incurred whether successful or not; failed attempt followed by replacement. No lifetime, downtime, warranty or environmental assessment.
不是实际成功率或利润预测。Not an actual success-rate or profit forecast.