Early MCS '04 68k miles.

The rattle seems to come from the front of the engine ( passenger side ).
Its definitely not the supercharger.

I'm thinking it might be chain tensioner? But from what I've read, this manifests itself either at low oil pressure situations and/or startup.
Or Belt tensioner?
Rattle is not consistent, meaning it doesn't have a click pattern, seems as if something is loose.
The rattle is very subtle, but scared it will get worse or could be the beginning of catastrophe?, so I took it to pep boys to see if they could offer any input, but they're useless.

What do you think?

Thanks, any advice is very much appreciated.