You may have agreed to repair or replace items on your property as a result of the inspection or as part of the original contract. Also, the contract requires you repair or replace anything broken since the contract was negotiated, e.g., the dishwasher stopped working, a window was broken, etc.
Failure to get repairs made prior to closing is actually a default under the contract. If a buyer is looking for a way to get out of the deal at the last minute, the failure to have all repairs completed could give them that out.
Be sure to keep receipts (when appropriate) as proof the repairs have been made. And send your agent copies of receipts before closing so they can be passed on to the buyer.