I know about hard to identify noice. I would hate to take it to mechanic, because you only have that fraction of the second when it is cold. So if he needs to reproduce it again , he would have to let it sit till next day.

 

Actually, it cools off quite quickly so you should be able to reproduce it after sitting an hour or two. There is really nothing that happens after 8 hours of sitting that doesn't also happen after 2.