Section. 3--411. Certification of a Check. (1)  Certification  of  a check is acceptance. Where a holder procures  certification the drawer and all prior indorsers are discharged. (2) Unless otherwise agreed a bank has  no  obligation  to  certify  a  check. (3)  A bank may certify a check before returning it for lack of proper  indorsement. If it does so the drawer is discharged.