My next check would be to check the rooftop vent pipe for obstructions. It also would probably bee a good idea to flood the tank with clean water to see where it re-appears. When you can't detect a leak, drain about half the water and then add a quality RV specific black water treatment, and let do its work.
Good Luck
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Pull Toy
Steve & Jan, Ava & Emma (Mini Schnauzers):
2016 F350 Lariat 4X4 Powerstroke CC/SB "PULLTOY V"
2013 Alpine 3535RE "MAGIC CARPET IV"
Proud Navy Vet!
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