How do I formally ask the seller to pay for or credit repairs?

[Bret Kingcade]

I just received my inspection report today a few hours after the inspection and am within my inspection contingency time period. Unfortunately, I was surprised to learn of potentially expensive issues with the foundation shifting. My inspector threw out a ballpark guess that it could be roughly 10k to repair it. This property is not listed on the MLS so I am not working with an agent. Now my question is how do I go about formally asking the seller to make the repair? The wording of the contract says "OFFER TO RENEGOTIATE with SELLER by notifying SELLER on the Resolution of Unacceptable Conditions within the Inspection Period." This is my first property purchase so I am unsure if there is a specific type of form that is usually filled out or if this can be asked in a less formal way. Any advice on this (or foundation issues in general) would be greatly appreciated. I honestly don't know much about foundation issues other than that they typically are expensive. Thanks!