According to the serial number of your washer this model has had the control board software revised & a new & improved wash plate added to address the out of balance condition. Other possibilities; I suspect a loading problem or leveling problem. Be sure the leveling legs are down tight on the floor & locked in place with the lock nuts. Please see the images provided below for more details.
If you do not feel confident repairing this problem yourself, then you can have it repaired at your home by a Sears technician. Here is a link for the website:
Sears Home Services
SAFETY NOTICE: Be sure to disconnect power to the appliance before performing any repairs. If you are not comfortable with doing any voltage checks that might be recommended, please contact your local service provider for repairs. Be aware that there could be sharp edges inside the appliance that could cause cuts or other injuries to yourself or others.