Called a mobile tech -- found that the black tank valve seal had been rolled when the valve had been replaced a couple of months ago. The roll was at the top and it only leaked when the tank was very full so there was greater pressure on the seal. Now I have to see if I can get any compensation for the repair from the RV shop where the valve was replaced. Ugh!
Thanks for all the ideas and suggestions!
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Full-timers since August 2017 in our 2010 Montana Hickory 3665RE behind a 2017 Ford F350 SWD Diesel.
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