Hydraulic Slides not working

[Outbound]

I would say you are low on fluid if it is alarming on corners. Your manual should have information on how to fill. If you have leveling jacks, retract slides, all levelers, then extend one jack approx. 6" leaving ignition on, you should now have system alarm bell sounding, add fluid until alarm bell quits, you should now be full. retract extended leveler.

[Bill767]

Your description sounds exactly like it's the relay I mentioned.

[1CoolZ71]

Finally found the issue. A BAD GROUND

I chased every wire, cleaned every connection and in the end it was a bad ground off the parking brake sensor.
The parking brake warning light came on when the button was pushed until I fixed the ground and now all works with no warning lights.