I don't believe there is a TSB out for '06 crew cab rear windshield water leak. However, I noticed that water dripping from the black frame above the small window glass on the passenger's side when I was driving in the rain. The dealer removed the entire windshield and recaulked it (actually they let Glass America do the work). They had to do it twice because the first repair attempt resulted in a leak from a different spot. You might want to inspect your rear windshield even if you do not have a sliding rear windshield when you find your rear floor carpet wet.