A buyer and seller may negotiate, while in contract, for items to be repaired. However, in the same manner that a Seller is not obligated to undertake repairs, a Buyer is not obligated to accept repairs. In the purchase contract, it notes that a Buyer may request repairs OR take other action. That other action, of course, can mean walking away from the contract. The buyer, though, would certainly be held to their obligations under the contract so "walking away" from it will have a result specific to the original contract terms (were there contingencies? was earnest money forfeited?, etc.).