10. This relates to the cost of maintaining the change during the service for as long as its required. These estimated costs will be included in the cost build up for the change as a contingency relating to the risk of repairs to the element of the service covered by the change. The risk also considers the length of time that the change will be required in the service; this may not be the period of the contract as some systems may be updated regularly through the life of the platform. Therefore, whether the change is a Replacement Change or an Addition Change, the cost for this risk is likely to be included in the SPV or sub-contractor cost element of the price and should not be considered in calculating the SPV profit level.