The door it's self is pretty easy to remove. Remove the top molding on each side of the track in the door way. Then pull the door over into the closed or nearly closed position and you can see where it's attached to the track rollers, just rotate the little locking lever and you can slide the rollers out of the way and remove the door.
Be advised that those doors are heavy. I fixed mine by adding washers to the screws, because the track in aluminum and the head of the screws are some small, and the door so D.. heavy, the screws just pull thru.
Because the walls aren't real solid, I was able to wedge a piece of wood between them to allow room to reach in.
Hope this helps, been there, done that!
Michelle & Ann
2018 Chevy 3500HD Crew Cab High Country DRW, D/A, 2016 RW39MB, Dual ACs, Auto Level, Auto Sat Dish, Stack W/D, King Sleep #, 17.5" Sailuns w/Disc, MORryde IS & Pin, Comfort Ride Hitch, 5.5 Onan, Res Fridge & Induction Cook Top