Those are high maintenance vehicles anyway, you do not need poorly engineered parts on top of that.

Have you contacted the zone representative for warranty and service? He would be the goto person on this. It would work best to meet FTF at the dealership.

Other areas for you to keep an eye on:

oil lines going to the oil cooler
shift servos in the transmission
ride height motor (air pump?)
in dash 4wd controller

and several others that escape me for now.