Water in your bilge and can't find the source? Take a look at the scuppers on your boat. I couldn't find the source until I happened to notice some lines I had in the lazarette were damp and tracked down the source to the tubes leading from my scuppers.. As the tubing leading from the scuppers to the stern drain gets old it dries out and cracks. I just spent last weekend pulling out the old tubing which had cracks in it (it was over 20yrs old). It was no fun crawling into the lazarette as I am just about 6 foot tall. Remember to plug up the stern drain before removing the tube leading to the scuppers or you will really have a lot of fun. Should have looked at this earlier as the anchor well drain also required replacement a couple of years ago.