That is/should be covered by the factory warranty. I forsee 2 options, remove the tank and patch it, or replace with a new one. A patch kit is sold but I forget the mfgr. IMO it will be futile to patch or replace the tank without first determining what caused it to break and remedy that.
2000 Winnebago Ultimate Freedom USQ40JD
, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert theConstitution. "Abraham Lincoln"