Our Dometic Fridge stopped working on 240v while we were away. Worked fine on gas so no problems as such. However, I prefer to use the mains I've paid for so I want to repair the fridge. I assume it is the heating element that's broken. ( Fuse etc. OK and the indicator light for mains comes on.) Is this a DIY job or do I have to take the caravan to a dealer? Quite a competent DIYer and confident and capable with mains.