For others reading this SLS means Self Leveling Suspension... which the wagon and one other model have... it runs off a pump built into the head of the engine in those models..
I suspect that thing works at something like 1800 psi... so fix must be legit..

Happen to have picture of problem area ?

I have been dealing with this sort of thing for many years...
What kind of tools do you have access to ?
Oxy-Acet ?