First, what brand toilet is it????
Thetford or Dometic ???
There have been issues with both, but not the same issue. With the water IN the bowl turning yellow when standing "above the black tank and sealed from the black tank" it appears that you have "dirty water trapped in the bowl cavity. That is probably from a defective bowl/base gasket. It's a "manufacturer's problem" and if your toilet is still in warranty, you will probably get a new toilet from the manufacturer. It's not a "Keystone warranty issue" but a "Dometic/Thetford warranty issue"....
Dealerships are "good/bad" so if you have a "good dealership" they'll likely file the warranty issues and replace the toilet under the warranty. On the other hand, if you have a "bad dealership" they'll likely tell you the toilet is bad and it's $400 to replace it, "parts and labor"... then they'll file the warranty to increase their parts inventory and profit, all at your expense....
Or, you can call Thetford/Dometic and do the replacement in your back yard.....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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