Freezer should be below 10 degrees. Is this unit in a slide room?
The most common failure of a cooling unit when it is NOT a leaker is this---The refer must be level at all times except when in transit. But, over the years, RV'ers while in transit and they stop, they have the refer ON and that stop however short IF the refer is off level will start a very miniscule blockage due to unlevel operation. Sometimes that off level may be for a few hours or even days or overnite. But, the blockage process keeps happening in very small parts. Then one day after years of this, the refer fails to perform and they think it just happened, but it was that accumulation over the years that finally caused it. Also, blocked or inadequate rear back coil fresh air ventilation can "cook" a Cooling unit in less that 24 hours. A Cooked cooling unit is completely ruined. Doug