I would suspect that thier are still some solids hung up on
the side wall sensors of your black tank. A good flushing of
the tank, by any means you prefere, should solve your problem.
First I would install a Black Tank Flush Kit." Due to this very problem, I installed one shorty after buying my Lexie. The other old-timer trick is to run some water back in your tank before heading from a trip, and dump a big bag of ice into the tank through the toilet. That will usually break loose even the most attached goodies!
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