2000 319 w/5.7/B3s. The bottom of my waste holding tank is leaking. The waste mechanic and I looked at it yesterday. It is definitely coming from the bottom, not the top. The next step is to remove the waste tank, which I don't think will be too difficult. I called Sealand/Dometic and they said there have been issues with the bottom cracking at the fasteners. I called Environmental Marine Services in FL and they said I need to send pictures of the holding tank and Sealand/Dometic will have to make a new one because that model is not in production anymore. The leak is getting worse. Am I on the right track?