Check the listing for details. CA1T-18B849-AD Lincoln MKX Lear THX amplifier *Remanufactured* amp core REFUND. Condition: Seller refurbished. Listed at 339.99 USD. CA1T-18B849-AD Lincoln MKX Lear THX amplifier *Remanufactured* amp core refund. Condition is Seller refurbished. This unit has been fully refurbished to resolve known manufacturing defects and is guaranteed to work. No dealer programming is required. This unit will be plug and play for your vehicle. The listing comes with the opportunity of returning your defective core amplifier for a $75 refund. Core refund process: We provide a return shipping label in the box with the unit that you have purchased.You return your old/defective core in the same packaging using the enclosed return shipping label.We process a refund to your transaction method within 3 business days of receipt and you'll be notified via eBay that a refund has been processed.Most units qualify for the full refund amount, though major liquid and physical damage can lower the refund amount.