I have a leak in both of my holding tanks. The Black water tank is leaking from the exit valve where it has a crack. The aux gray water tank is leaking from who knows where? I have been unable to find any replacement tanks available at inlandrv, out of doors mart, or vintage trailer supply. Does anyone know where to get these replacement tanks? If you know how to remove the tanks, please reply. My restoration was going great until I discovered this major leak issue. How hard is it to replace the tanks with vents and plumbing? Can these tanks possibly be plastic welded or repaired?