I have noticed a squeak coming from the rear shock absorber on my '02 Superglide. It sounds like it is only coming from the left side. I don't notice at all when I am riding, only when I get on and off the bike or bounce it up and down slightly. I took a good look at the shock and nothing is leaking and the rubber bushings are in good shape. The service manual states that there are no repairs possible on the shock and it has to be replaced as a whole unit. Is this something that is normal or should I be concerned about it? Do you guys think the shock needs to be replaced? Like I said it still rides just fine.