As stated in other posts, crack open the front hydraulic ram fitting, some fluid will come out, tighten it back up.
Worked for me just recently.
Opens fine now.
I did change the fluid while I was doing the task.
Had to bleed it one more time about 2 days later.
Karen & Barry, Dogs Tinker & Toby
2007 American Tradition 42V, Cummins 400ISL,10KW Gen,Hydro Hot,TPMS,Garmin RV770,2017 Ram Lone Star 4x4 Toad,RVi3