All's Well...
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Randy went back yesterday and, as instructed on the web site explaining extractive bleeding, rerinsed with warm water and sprayed a solution of oxalic acid. Returned almost immediately to it's normal color. So...
it appears that the finish had probably failed, exposing the wood, which was still full of the tannins and stuff wood's full of. The sodium hypochlorite changed the chemistry of the wood, just like in decking (although I've never seen quite that color on a deck!) and we returned the chemistry back to normal with the acid.
Magic. Thank goodness we didn't have to call on our liability insurance.
Thanks for all your help and input.
Laurie and Randy
All American PowerClean
Lake of the Ozarks, Missouri