Welcome to the forum!!
We have had some success using PbBlaster. Open the valve and spray the exposed rod/cable. Cycle it a few times and repeat.
Do this every time you dump for a few times and if it doesn’t work, replacement is probably needed. If it’s under warranty, I would schedule a day to drop it off for service.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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