Camera inspection of the path to the septic and/or vent would be good and time-efficient.
Here is another way that can be done cheaply, but requires sufficient motivation and time:
You would look for pressures, or even vacuums at various spots. When you try a spot upstream of the belly/blockage, then the pressure will match atmospheric pressure. When downstream of the problem, then expect to see a displacement of the water in the tube at times.
If you try this, take photos. We would like to see photos of what leads to your successful diagnosis.
Here is another way that can be done cheaply, but requires sufficient motivation and time:
You would look for pressures, or even vacuums at various spots. When you try a spot upstream of the belly/blockage, then the pressure will match atmospheric pressure. When downstream of the problem, then expect to see a displacement of the water in the tube at times.
If you try this, take photos. We would like to see photos of what leads to your successful diagnosis.
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