Hello! I do not have any direct comments for your sound issue. However, I have a JM as well and I would be more than glad to photo any area you request. Maybe to confirm you do not have different wiring or components installed in yours or something did not come loose. Lol...maybe I would benefit too because I am not positive mine is perfect lol. Anyway, if you need any type of photo please ask. I am laid off work so I have plenty of time now. I can help in that way as much as needed
Gl and please do not hesitate to ask