In legalese you have the concept of 'rectification costs', especially in the context of a damages claim. The context is not entirely clear from half a sentence I am presuming it is an industrial contract. In the case of a rental lease or insurance it would be rectification costs for a damages claim since the calculations for a legitimate claim is based on the costs incurred for rectification.

From the sparse context given I would say that the Schaden in this case look like defects (e.g. manufacturing faults) rather than damage.

I think this is the most natural term to use but the context is important and Swaroy and Armorel would have the better expression according to the context. "Rectification of damages" for damages claims/claims related to human error and "remedying of defects" when the context is one of production error.

My suggestion.