Okay..while i put on my school teacher hat
stop and think for a minute
what makes the fridge able to switch from electric to propane
either automatic or manually ?
the control board !!
what runs the igniter to light the propane flame controls
where does the power come from to run the controls ?
the 12v batteries !!
most things in an RV are a matter of simple logic
and most things in the RV are powered by OR controlled by the 12vdc system
the repairs might take physical work or replacing parts or fuses or something
BUT most can be figured out by simple logic
Hope this helps you in the future