I have a 1984 340 Sundancer. The 51 gallon fresh water tank has started leaking and I need to replace it. I have found a small removable hatch just outside the door to the head that is fastened by screws. There is no way the tank can come out through this hole and i can not find any additional screws in the carpet where there would be another hatch. Does anyone have experience in this and can give me some pointers on how to get the tank out?