Peel the foam from around the drain, then just remove as many screws as you have to allowing you to peek in where the drain is.
There are a few possibilities, and if the tank is cracked, no a mobile mechanic isn't going to be able to fix it. Fresh tanks are made of plastic like milk jugs so welding isn't much of an option. I can't say any repair method I have seen/used has been successful.
Replacement isn't that difficult. Much easier than a gray or black tank.
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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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