Jason Monaghan

I need some serious assistance. My Dometic fridge has the gas or electric options, and i have the same problems as listed above. I have tested the 12v it read 13.57 there is continuity. i have a friend with the same RV and i tested both the upper and lower boards in his RV and they were functioning. I tested his boards in my RV they did not work.I have tested all fuses, all are functioning. There is no smell of ammonia. I did find a fuse that was blown outside of the trailer next to the battery that looks as though it powers the 12v system. With a charged battery all lights and fans work. I have read this forum and tried everything that the group has listed.At this point i am about to pull the fridge out and look for poor connections behind the fridge. i am at a loss