In most cases, the failed part may be returned in the packaging used for shipping the replacement to you. If that packaging is damaged, however, please ship the part in packaging that is as good or better than the Zerowait packaging materials. Returns go to our corporate location at 707 Kirkwood Highway, Wilmington DE 19805. Please write the RMA number on the outside of the box. Ground shipping is okay for all but head units, which must be shipped 3rd day Air or by Freight on a pallet. Special care should be given to the flanges on DS14 model shelves and if you have questions about this, please contact our shipping department at 888.811.0808 prior to shipping DS14 shelves back to us.