Glad to have you here with us.
The tech warned you against using the levelers?
That's what they are there for. Using the levelers will take strain off the slides and will keep you from leaning.
Have you looked at your fuses for the slides? Does the front slide still work? Are you plugged into AC? Slides can be finicky about low voltage.
Best of luck and Happy Trails!!!!
Tony & Ruth........... FMCA#F416727
Newmar Dutch Star 4320, Spartan MM Chassis, Cat C9, Jeep Grand Cherokee,with Hemi, hooked up with a Blue Ox Aventa LX, and Brake Buddy.