Cant fix Mixed content errors – https

Hei… Im getting mixed content media errors. Seem to be images i no longer use nor have on the installation. I have used the Chrome developer tools / console to find the urls. Used Better Search and Replace plugin to find them and replace with the existing images (yes the identical images are in the media library (different folder in server) but not used on the site). I get no replacements. Im at a dead end. Is it possible that you troubleshoot this for me please? ps. I do have screenshots but i guess i cant upload here.