Writing to Customer / Client on Replacement Sale of products sold previously where warranty has expired / end of useful life according to record.
Thank you very much for your order of [Product] from us [number] years ago. We hoped you have been satisfied with the [Product]. Years have gone by and the [Product] is near the end of its useful life. We are pleased to inform you that we have a replacement program where we would trade in the old [Product] for recycling, in exchange for a new [Product] at a % discount.