If the grey and the black tank valves are leaking you are best off to replace them. You can try repeatedly flushing both tanks, even use some dawn diswahing liquid in the tank and let it slosh around see if maybe it may clean the seals enough to hold.
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Tony & Ruth........... FMCA#F416727
2016 London Aire 4519, Freightliner chassis, Cummins ISX, 2018 Jeep Wrangler Unlimited, Blue Ox Avail with AF1. TST 507 TPMS
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