[Dennis4809]

Not familiar with your rig, but do you have two black water tanks or does your use a pump to transfer waste to the main tank? If it uses a pump, is it working?

If you do have two black tanks, do you get any flow or is it totally stopped? Is this a recent thing or has it been this way since you’ve owned it? I sure wouldn’t start tearing things apart as you’re looking at a lot of expense. All those fittings are one time use.

There are folks that specialize in fixing your problem. I think most start with a camera to go in and see what’s actually wrong. Then using a variety of tools, they’re able to clean up the mess.