Assuming the tank needs replaceing just cause of soft spot in tank lid is over-thinkin the situation...the soft spot can be easily repaired, but there's NOTHING easy about pullin a tank...if you have no indication of a leak or other problem, just take care of the soft spot...search for tank lid repairs on this forum...it's been don several times w/great success!!...good luck and let us know how it goes...we like pics of projects like that..helps everyone...