One option is RV Septic pump truck and have read where (some) found that issue where the plug from cutting hole for pipe was left in the tank at the factory; it would finally move to position that blocked pipe drain. Also, issue for OWNER is no shop will work on waste tank that is NOT empty, so try to find a truck. CW or dealer shop maybe able to point you to one? (IF you can get them to answer phone?) Edit/add: Personally, I use/ like the CAMCO SWIVEL STICK, (spinning water jet connected to city water pressure.)
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THenne1713
2000 Conquest LE 6266, Class-C on 99-E450SD, 6.8, 2v, V-10
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