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Henry,
It would appear that you have not had the rig too long. But if you have not let your tank fill up before draining it you may have the dreaded pyramid build up. Water water, water is the answer to preventing any build up of "stuff" in the tank. And never leave the black tank valve open. That is just asking for trouble.
There have been reports of the cut outs for the tank's plumbing being left in the tank. This, of course, can cause "stuff" to get caught in the valve area.
Good luck and let us know what you find out.
HamRad
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