This must be from a technical service bulletin they got from the manufacturer. If the part has proved to be troublesome, they might want to make sure yours don't have problems. Either that, or they want to pick up a quick coupla hundred for 10 minutes of work. Look in your owner's manual and see if it is a necessary maintenance proceedure. There are 6 little 10mm nuts on the inner mount that I have never seen come loose without you intentionally loosening them.
