Jason Davis
I'm not sure on what you mean by slipped, if you mean that the post has snapped internally and is leaning then it will need to to removed, To remove you will need to dig around the original concrete below the ground level, hire a concrete breaker and break out the concrete, once the concrete is removed you can the remove the post, once you have removed the post replace with a new post, then concrete in place making sure the post is level regards Jason
