The reason nobody ever finds the trunk leaks on the 1st gen luminas, is becuase their pretty much hidden. The actual leak is coming from the trunk seams, where they were welded together and filled with bondo from the factory. With age, it falls apart and lets the seam leak water into the trunk. I know this because it does this on all of the three luminas that I own. I've tried removing all the old bondo, grinding it down and re-filling it and painting it, but for some reason the trunk still leaks at those seams. It's a very hard place to repair properly so I've just taken it as a loss and I don't have a system in the trunk because of this.