Study the following paragraphs. Then write an appropriate subject line and opening sentence for each one.

Your complaint message about our XR-310 Amplifier Tubes that were broken in transit to you has been directed to me for response. Thank you for telling us immediately about this mishap with your Order No. 2190. We also thank you for your thoughtfulness in noting the damage carefully on the express receipt. That information is very helpful. We are sending a replacement shipment of your entire order of XR-310 Amplifier Tubes by prepaid express and expect that it will arrive by February 20 to replace your stock.