Call the Supplier directly, provide the PO number and identify the item(s) for return and obtain a return authorization number (RMA or ATR number).
From the Marketplace home page locate the link "Return Pickup Request (MSS)" in the box titled UC San Diego Goods and Services, and fill out the Return Pickup Request form.
On the form, you will need to have your orginal PO number, RMA or ATR number from the supplier, and your index number.