Hello,
This character has a weird, small animation when I scrub the timeline and I can’t find the keys for it.
The chest bone just rotates a bit when I am trying to animate, and this gets included in new actions.
Any ideas how I can find these animation keys?
The rig is a legacy one, from another character if that helps. There are some cruft animations to clean out, but I don’t see how the short, problem animation can propagate to new actions.
No blend file to look at = no replies, we cannot see your desktop from our desktops, so have not the slightest idea of what could be wrong 
Cheers, Clock.
Try to select all bones and see if anything appears in the dopesheet
Ok after deleting the actions the problem is gone. Thanks for the replies.