Welcome to the forum
First off there are no schematics for public view. That said, you will need to either use the tools and fittings made for high pressure hydraulic hoses, or remove the hose for repair/replacement.
If your going to remove the hose, just unscrew one side of the underbelly do you can trace the route of the hose. Sorry, but I don’t know of any simple way to fix your issue.
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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.