Leak

When we purchased our 2004 IP 370 in 2008 the surveyor detected water stains in a storage compartment (port side, main cabin). The seller's broker cleaned up and re-bedded a life line stanchion and the problem appeared fixed. 2-3 years later we discovered wet books, etc. in the vicinity of the earlier leak. I detached, cleaned up, and re-bedded the same life line stanchion. We have had no problems since in that area.

This year we have a leak in the aft compartment. After a heavy rain (not a moderate or light one), water accumulates on the wood shelf that runs aft of the locker/nav station. We can reach up and feel water above the lip in the area of the hull-deck joint. There is no water in the "lip" above the nav station or forward of the nav station. We think this means we are fortunate in that the leak appears to originate in the aft port quarter of the boat. Is that a logical conclusion?

In order of priority, what are the likeliest sources? I assume the lifeline stanchions are candidate number one. We plan to run water starting as far aft as possible and then move forward until there is evidence of the leak inside.

Check the usual victims such as stanchions. Also check the port lights. On the outside up against the glass is a small round hole that allows rain water etc to drain out onto the deck. Internally there is a weld that can fail and allow water into the boat. This happened on my boat five years ago and I now have a second unit leaking into the boat. This is an unusual failure but worth checking out.