Dear Khun Lek
Thank you for your promptly reply, I will read it through first. If I have a questions, I will raise on it and send to you to clarify later. I may request 2 weeks from here to read it and review. The second week of March, I will send the questions and make appointment with you to get the answer. During the time, if you have any updated version, please send to me. I will update on my reviewed version krub.
I hope this final RCA can help you to improve the operation controls.
Thank you & Best regards,