May I make a suggestion?
Gordon is answering a high volume a posts each day. Many require research, or perhaps an inquiry to Yanmar, as yours probably did. You may get a better response by assuming Gordon simply missed your post, or has not yet found an answer. Assuming he intentionally ignored it serves no purpose other than to antagonize Gordon, which truly serves no purpose.A more appropriate response might be to re-post your question with a reminder that it is still unanswered.