Last night, we got the lid off the water tank under the aft berth. I used a couple of putty knives to wedge it off a little at a time. There is a reinforcing bar running fore and aft on the bottom of the lid and a full height baffle running diagonal from starboard front to port aft corners of the tank. The baffle has several 2-3" holes drilled into it at various places. The baffle is removable. Our tank was pretty clean. We just had to pump it out and just scrub it with a brush. We brought the lid home to clean it good and cut inspection ports into it. I am still looking into what kind of sealant to put around the rim of the tank to prevent leaks. I took some pictures of the process and will post them here when I get them developed. Rip