My first comment would be to drop the bottom to have a clear inspection of the tanks and connected piping. In regards to the black tank...if you are putting poo in and getting no poo out on dumping, there has to be a partial blockage that is allowing contents to settle out before it can leave the tank. If you see clear even with the nose of the trailer higher than the rear and someone flushing a bowl of clear water, then it is clearly time to drop the tank. You don't say which grey tank, shower or galley, is also an issue. Again, dropping the bottom allows for you to see everything and understand the issues. I hope you are not expecting the normal tank level monitor to give you insight into tank levels as the normal system is less reliable than you trying to use esp to know tank levels.
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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