I'd look at the vent stack, the 3" black PVC pipe from the toilet to the tank and if both of them are intact, then I'd suspect the toilet flange gasket. It may be allowing a bit of leakage around the toilet base. If you crawl into the passthrough and look up, you'll see the toilet base at the top of that 3" black pipe. Finally, and hopefully not your issue, the top of the black tank may be split. If so, there are some repair kits available, but to use them properly, you need to remove the black tank from the trailer. If you're going that far, might as well install a new tank rather than risk a repair failure.....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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