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OK, my tale of woe, this may help you.
On out first real RV, our Keystone Sprinter, I had the same problem. We were at South Padre, tank wouldn't flush, I was banging the pipes with a rubber mallet to get it loose, no luck with that Barney Rubble tactic, so I went for my small bottle of Co2 with a hose on it.
I stuck it down the stool, packed rags around it and just barely cracked the valve on the 1500# of non regulated pressure...
Whoosh, out came the mess into the hose and we lived happily ever after.
Try air pressure in the stool. Probably won't take much.
In the future, Flush, count to 6 or 7, then stop flushing. This will help.
Good luck.
Ozz
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