We are residential GCs. We emailed a homeowner Invoice 5 what we thought was going to be the final payment. But we found out homeowner purchased her own paint in a different color and had our men repaint the kitchen incurring more labor charges for us. I emailed homeowner a revised Invoice 5 with additional painting charge. Homeowner refuses to pay any of the charges on Invoice 5. I commenced preparing a just and true accounting and learned that homeowner had several extras that were never billed. Meanwhile, homeowner send us check for the original invoice amount with the memo referencing that document. The memo does not say paid in full. Can I cash the check and not lose my lien rights?