How do you access the frehwater tank on a 3600 Martinique?

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Hope someone here can help. I have a '97 3600 Martinique and my wife and I filled up the fresh water tank for the first time this year so that we could flush and sanitize the tank and system. We opened the faucets and waited for the water to come out and waited. No water! She happened to look over the side and said we must be getting water out of a faucet because water is coming out the side. I looked and immediately knew it was coming from the forward bilge. I pulled out the aft bed and opened the bilge cover and sure enough there was water. Does anyone know how to access the fresh water tank. My wife called a local Wellcraft dealer but none of the people knew anything about this model and she, myself and a friend have not been able to find any information on the internet.

Can someone please help? I'm now carrying 5 gal. water jugs for drinking, cooking, washing and pouring in the vacuflush and they're darn inconvenient.

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I found the freshwater tank. Its located midships just forward of the galley. Inorder to access it you have to pull up the carpet, no easy task as you have to remove every screw that holds down the port and starboard seating. The problem turned out to be that one side of the water pump suction line wasn't seated properly in a splice and was leaking by. I just had to reinsert the line properly and that did it.
I found one thing odd though. The tank is oriented so the suction is at the bow end of the tank. That just seems wrong to me so my winter project will be to turn the tank around so the suction is aft and while I'm at it I'm going to install an external type level sensor so I won't have to guess how much water is in the tank. I'll let you all know how that goes.