Dometic fridge issue

After despairing with poor performance from our Dometic fridge, the whole chiller component was replaced at significant cost. It’s still a poor performer and Dometic advice that the specification is for a 16deg C drop from ambient temperatures, which is a bit of a joke with summer temperatures today. If your heater is working, it sounds as if there’s something stopping circulation through the refrigeration section. As I recall, our repair cost £450 or thereabouts. Re-gassing wasn’t an option.