I did an experiment today, based on posts online, to try to find the source of the leaks into the cabin. I assume the leaks are from the sunroof, and I'm right. I poured water into the sunroof channels, and EVEN THOUGH the water is draining out of ALL FOUR drain holes onto the ground, it's still dripping into the cabin. The left rear caused the destruction of the nav computer. Anybody's thoughts? I'll go ahead and clean out the drains, but am not sure this will work, since the drains are draining.