So I sold an amp on EBay just over the week ago, and arranged with the buyer to come and collect it last week. He paid up, came and collected it and tried the amp out (showing no issues). All happy.
Today he messages me to say it has developed a crackle and wanted to let me know "in case it became a terminal issue." Clearly, he's thinking along the lines of a refund if unhappy. Where do I stand with this? My description was fine, including a No Returns status. Never had an issue with it, and it all worked out when collected.