Has anyone adjusted or repaired a recliner chair.

You think it's wear on the joints?

Good question. I've moved a few which usually involves partial dismantling, and have never seen obvious signs of wear in the joints. I don't think they usually do all that much movement. I think I repaired a mechanical failure in the dim and distant past, but can't remember details although I am sure it wasn't wear.

Obviously, almost anything is mendable, but I suspect that a "professional" repair for worn joints would not be economic. But maybe the whole internal mechanism could be swapped out for a new one.

If the joints were worn, I would also be worried about the state of the motor / gearbox etc.

What sort is it? There are all sorts of reclining chairs. Pic?

What make is it. Is it a manual or electric recliner? There's lots of stuff online about recliner mechanisms - Google is your friend!