What are the repair items that were listed in the appraisal, if any?
Those repair items required to be repaired by the appraiser must be completed before you can close. Repair items not required by the appraiser are optional. If the seller doesn't have the funds but had previously agreed to repair those items, ask the seller to give you a credit toward your closing costs for $X (whatever you can negotiate). That way you have the funds to make those optional repairs after you close.
Remember that the seller is limited to a maximum of 6% of purchase price for a seller contribution. Also remember that the contribution has to be toward your closing costs and pre-paid expenses and not toward repairs. You would have to modify the contract with an addendum and submit the signed addendum to the lender. Check with your LO before you do this though to make sure it won't hurt your approval.