Leaking units will operate normally in every sense except one.......they WON'T COOL. That is because there is no ammonia or hydrogen left in the cooling units.
In my experience, RV type refrigerators can NOT be repaired with any lasting success. The coolant in these is a VERY PRECISE mix of ammonia, hydrogen gas, water and an anti-corrosive called sodium chromate. It is the sodium chromate that you see when it leaks (yellow) and the ammonia that you smell. The only company I have found that can do that for you and that can replace the required refrigerant if Ford & Ford in KY. Still, prices are what should be the deciding factor. as well as warranty coverage.
If you have a leaking unit, you have 2 options: replace the cooling unit (entire back of the frig) or replace the entire frig. I've replaced at least a dozen cooling units in the last few months. It's not a really big deal! Just follow the instructions carefully.
The aftermarket companies sell cooling units for just about any Norcold or Dometic out there. The OEM units are VERY expensive.......50-75% of the cost of a new unit. It's a tough decision which way to go