A friend has a JD6420 with cab/4wd tractor. A severe oil leak has started behind the fuel tank. After inspection we believe it is the pressure hose supplying oil to the steering unit. The hose can be inspected by removing the small cover in the cab floor. There are 3 hoses of different sizes beside the air vent ducting. The hose that is leaking is the mid sized one as they are all of different diameters. The question is how to replace that hose. Hopefully without removing the fuel tank. Believe the part number is AL157268. Can that hose be replaced without any major dismantling. Appreciate any help from anyone who has done this. Thanks.