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It's a big ask to expect the typical tank sensor system to function perfectly after 17 years. They use flimsy low-gauge wiring, because it works using a low voltage resistance principle.
Do some research on how the system works... it's really pretty basic. Check the connections on the back of the wall panel. Crawl under and check the wire connectors on the side of each tank. If you get good continuity from panel to sensors - no broken wires - focus on cleaning the inside of the tanks.
I suggest completely filling your waste tanks with soapy water and soaking them for several days... Driving around to agitate the water helps. Then flushing completely. It might take several cycles of this for results. You never really know how well those tanks were maintained and flushed.
Good luck!
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