I have a 1988 30 TM and am in the process of replacing the holding tank. The hoses have been removed from the tank, (with great difficulty) but the tank does not fit through the cut out under the port setee. I'm not sure if the tank has a crack and do not want to cut it up for removal. Is there any trick to getting it through the cut out? It seems that about the only way it can be removed is to use a jig saw to make the cut out larger. Any advice will be appreciated. Thanks...John