The tank was removed so that complete access could be provided; this was done by a large RV dealer in Hammond, LA.
The tank had to be able to be inverted and the contents attacked by plumbing "snakes" and high pressure water.
I understand it took three men to shake and roll the tank to break up the clogged mess. Must have been real fun.
Camping World and this dealership share the same area and building.
Camping World has always been of great service to me for a long time and I was comfortable with their recommendation.
I can now put 5 gallons of water in the tank and get 5 gallons out when I dump. The level sensor now works as intended.