Have you tried flushing the tanks? This happens to us fairly often. For the black tank after it’s drained Roadtrek recommends an attachment you put dow the toilet to clean the tan. For gray I use Thetford tank blaster powder or Cascade dishwasher so
Junk sensors on the tanks. I haven’t had one RV that read correctly. There is an upgrade for the sensors. My 2023 firefly is the same as many others are.
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