Hello Craig. your hydraulic system is pressurized at 2200- 2500 psi -extreme caution is recommended. - you can test for leaks my dead ending cylinders. with the high pressure any leak will soon be visible. DO NOT PUT YOUR HAND IN FRONT OF LEAK. USE a piece of paper or cardboard. The system will take out all air when you use the hydraulics.

Water or condensation from exhaust is normal -usually caused by
stop/starts.

hope this helps