I just bought a 98 Accord that I don't know the background on and am slowly discovering things about. The trunk on it leaks also, but I have found cracks in the body seam filler on the driver side of the trunk. It is obvious to me now (after buying it of course) that it has been hit and repaired in the back. I don't know if this contributed to the small cracks or not. I am having the rear bumper cover repainted ($350) and asked the body man if he can apply new filler and paint it to match the car. He said he could for about another $30. Hopefully that will fix it. If you don't mind the looks, you could just apply some clear silicone to it yourself if you find cracks. Just grab the trunk seal and lift it, it should come right off, and look for cracks under it. Hope this helps.