Start off with the easy stuff....Is the circuit fused ?...I don't have this feature so I don't know where a fuse or similar would be located...track it down....
Next maybe to check if any power is getting to the lift motor....do you have a test meter to check ?....If the lift assembly is power up and down....maybe a relay is present ....and stuck or failed...
Wes & Denise
2015 38RL, Full Body Paint, Slide in Slide, full Laundry, RV Fridge, 5.5 Onan, Magnum Inverter Charger, Samlex Solar, Trav'ler Sat System. Heated Tanks, R.O. Filtration, Sailun Tires**2016 F-450, Reese 25K Elite