Just got back from having my oil changed, and this is the 2nd time they have told me that my rear differential had alot of water in it. The first time was just month ago (put over 3000 miles on K5 in the past month). I haven't been any water that I know of (at least not off-road). What do I need to check and/or do to fix this? I've never done anything to a rear-end before (wait, that doesn't sound right /forums/images/graemlins/rotfl.gif ....ya'll know what I mean)...any advice apprecciated.