Thanks for all your ideas. I tried a bunch of different approaches frontend/backend with water flushers, etc but nothing worked. Had a mobile RV Tech drop by and $155. lighter I was still no further ahead as he tried some of the same stuff I did with no luck--his conclusion was a foreign object in the tank and big $$ to investigate/fix. Decided to hook up the rig this morning and with 2/3 black water on board hit the road for about 1/2 hour to shake up the black water----IT WORKED!! Regret I didn't do this before calling the RV Tech so lesson learned.
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