Rattle sound from passenger side valvetrain..

I pulled the rocker shaft off, there was no un-usual wear, the pushrods did not seem bent, I pushed down on each pushrod and didnt feel any movement in the lifter.. I took a video of the noise, but I am not sure how to post it to the message here...
I,ve had luck loading vids to you-tube,then copy/paste here.It takes abit of time,but works.Good luck.