Dometic Refridgerator stopped cooling

New units can be very expensive unless you are thinking about a residential unit. As stated earlier if there is/was no ammonia smell and there is no yellow powdery residue around the gas burner (indicates a cooling unit leak) than a repair will be A LOT less expensive and less invasive than a replacement. Even if there is an ammonia smell or yellow residue it will still be a lot less expensive to repair.
If the cooling unit is ok then there isn’t much else left.
Control board, Blown fuse, Rodents ate wires, all fairly inexpensive.