I have looked at his electrical set up and found three things that I would possibly change the first being that the solar is tapped in on the main not a breaker the second is maybe changing out the surge protector not just due to age but the validity of the product and third is that the gfci's for the bathrooms are reading hot and neutral reversed which should be a level one rewire, they are fixing to go on vacation and have to talk about the possibility of this work for themselves