I own a 1998 LX 470 (which I purchased in 1998) and I once also had a similar experience with water around the sunroof. Nothing to worry about! It was easily remedied with a burst of compressed air in each drain hole. A local dealer or body shop should be able to take care of that for you. They may charge $20 to do it, but more than likely they will do it for free :)
If the problem persists, it could be leaking from different source. I would also check into a clog or a leak in the drain tube channel. It is definitely a more complex and costly problem. It is my understanding that it could take 3-4 hours of labor removing the head liner, A-Frame, etc... to replace a $50 tube, so for your sake, check the drain holes twice!!
Good luck! I hope this helps !