Unfortunately for those that might come across this in the future I am not sure if this solution will help you. As I worked out the offending image was in the footer. I ended up just clicking on various options in CUSTOMISE>>FOOTER BUILDER and then I selected the PRIMARY FOOTER and found BACKGROUND which has options of COLOR/ GRADIENT/ IMAGE and when I selected IMAGE there was a broken image link icon and the option to “Remove Image”. So difficult to find but fixed now.
