Welcome to the forum.
You might get a better view if you take the rear wall of the basement off. It’s common in fifth wheel trailers to have water connections in this space. After you get the wall off, hook up the water and turn it on. Look at every connection and if it’s all good, then run the black tank rinser. Water can come from lots of different spots.
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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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