Your complaint about our recent shipment of MESA 12AX7 preamp 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. 008976. 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 by prepaid express and expect that it will arrive by March 15 to replace your stock of guitar and bass amp tubes.

Your Task. 

Revise the above wordy openings for message so that they are more direct and concise. Write an appropriate subject line and opening sentence for each one.