I've finally figure out thru HWH schematics that I have the 625S leveling system. What a pain just to figure that one out. No data in all of my manuals that would help me identify it.
All of the testing and information I've gained, says it's the wire labelled 9000 on the 12 pin connector on the back of the controller. I will disconnect it tomorrow and install a temporary ground to the 7th pin. If the LED #35 comes on, I know it's either the connection, wire or the parking brake switch.
I'll post my findings when completed.