Cautious Black Tank Flush - Grand Design Owners Forums

We recently bought a Reflection 337FPS and cannot flush the black tank using the instructions in the owners guide. I did take the RV to a dealer for warranty service and was told it only had a "stuck check valve". I am unfortunately in self quarantine for the COVID-19 virus, but found the same issue this morning. I am

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Cautious Black Tank Flush - Grand Design Owners Forums