Is it a jacknife type or fopdout,or what? Look for screws holding the sides and front to the frame. If it is a jacknife type, the back and seat will have bolts ataching themto the frame. Take them loose and remove.
Noel and Betty Johnson 2005 GulfStream Ultra Supreme, 1 wife, 1 Poodle
I'm not familear with your unit, but I took my jacknife couch out of the RV, buitl my own couch with storage using only the matress and cushions from the jacknife.
I don't know much about the fold out type, but the jacknife will come apart. First determine if you can get the two pieces (frames with seat and maybe the backrest frame if you are changing the color or pattern) out through the door.
1 Unfasten clamps from the floor
2 Remove hinge pieces (steel bars,the hinges are welded on the frames)
3 Remove leg assembly
Mark or write down where each of the pieces go for reassembly.
My RV has a rear kitchen and door so it was a challenge of csareful manouvering.
2000 Ford V10 Triton, E350 Super Duty
Just for me,the Mrs and Gabby
If other than a jack knife, there should be locks/latches on either end on the back under the cover, holding the back to the bottom. OR the back may just slide down into some grooves on either end. My Springsteel sofa came apart that way along with the replacement double reclining wall hugger love seat I replaced it with.