Plus (X / 1.5) * (1 - S), where S is probability of successful repair.
Plus the repair cost of the next thing to go if many parts are reaching the end of the design life (= warranty * 1.1)
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Plus (X / 1.5) * (1 - S), where S is probability of successful repair.
Plus the repair cost of the next thing to go if many parts are reaching the end of the design life (= warranty * 1.1)