Backed out bolt on 07 versa s 1.8l 6 speed.

[kat_hat]

Hey guys,

I was under my hood the other day and noticed that there was a bolt backed out on the top of my transmission... its underneath the battery tray but its visible without removing it.

I screwed it back in and after week it hasn't seemed to move. But there still remains the fact that there was a bolt that backed out on its own. Have any of you seen this before? How concerned with this should I be? I also looked through the FSM but some of the diagrams are a bit hard to figure out sometimes so I've had some trouble identifying what this bolt is for/what its suppose to secure.

Any opinions or advice would be appreciated guy!

Thanks!