If it's an electronic lock....I'm out. However if it's manual, Greystroke's experience is much like mine. The door on our 05 Monaco started 'sticking'. What really happened was the doorhandle would not engage the doorlatch unless we preseed hard against the outside skin of the door just a few inches right of the door handle.
I ended up having to pull the inner skin off the door in order to adjust the upper and lower door latches. Since I adjusted the latches, no more sticking. If you check out link
entry door latch adjustment 03 Holiday Rambler Scepter 36PST
the 3rd entry by K7JV has an attached file with pics on how to perform the adjustment.