When you say behind .... are you referring to the area outside the camper where you remove the grid cover area. Or did you pull the fridge out and look behind? No luck yet. The gas is lit so will check that out for awhile and see if that works. We know it's getting electric and gas so guess that means fuses are ok? Ours is probably out of warranty.
No yellow or smell that we detect, no loud noises, no obstruction that we can see up to the back refrigerator slats (whatever that's called). Checked that from outside, hard to see though up in there and nothing looks odd on top the camper.
We did find a place 30min from here that may work on it. We are at a seasonal site.