I had a '94 26 many moons ago. No inspection port under companionway stairs, but valve and drain plug. Others have self installed inspection ports. yours shows some cracking. When I first got the boat in 2000, it had been sitting for a while but seemed dry. when I sailed the first few times, water under galley, head sinks and a few other places. after much agita and a repeat performance of a 1 gallon water tank under galley sink breaking...found out that water on top of ballast tank will deposit at the lowest point, which varies in a boat. think of a roof leak in a house. alan