If the marker has sunk, I believe there is no charge to put dirt under it to raise it. You fill out a simple request form and they will put it on their "to do" list. We had a couple raised a few years back. Also, don't recall if Westlawn is on gravefinders.com, a great site that provides direction to a specific marker. Forest Lawn is on that service but Westlawn may not. Just don't recall.
The west doors to the funeral home office are closed in the afternoons on the weekends, but you should still be able to enter the front doors and the receptionist will be able to help you find a location in the cemetery and give you a map.
Thanks! Your answer is awaiting moderation.