Okay, here's an update with some more questions...
Okay, I kept my ears open for the leaking air sound. I didn't hear any air leaking, but more of a whirring sound like the motor on that specific door is still trying to get the lock down even after it's already locked (it's been locking lately since the weather has been cooler). It's not the normal whirring that goes on after you close the door you usually hear coming from the driver's side rear area. It comes directly from the pass. rear door and probably lasts for about 5 seconds. Something is definitely wrong with it.
Now, for my question: How hard is it to take off the interior door panel? I want to take the driver's side one off anyway to replace that light anyway, so are there directions for this? Thanks guys, I really appreciate this.