I had all of the levelers up and slides in as well. I took a wrench and just loosen the fitting until it was dripping into the pan below. It didn't drip real long. There was no spray from pressure in the lines.
Can you access the fitting with the slide closed? or at least 75% closed?
Is there a special process after hooking the hose back up to relieve any air that may have been introduced into line? Also, sorry if this is a lazy question, but what type of fluid do you add to the reservoir?