Hey Honda fams.

So have a 2010 TL 3.5. This is may be simple solve for some but not for me hence y I’m here. I’ve tried Google to no avail.

While driving I would turn the steering wheel left to right then back straight.. like a mechanic would do to test the front end for some reason. Not sure of the terminology, I guess slightly swerving. The car is still barely moving left to right while hold the steering firm and straight. I can feel a motion effect of that left right swing/turn before the vehicle goes steady again.

can anyone say what part would be the culprit?
the sway bars and links looks fine. Alignment done, wheels balanced. This started about a month now.
or is it the upper tower strut bar