Ok, for anyone that might be in this situation in the future, here is where you will find the line:
general-template.php
template-functions-general.php
look for these lines
function rsd_link() {
echo '<link rel="EditURI" type="application/rsd+xml" title="RSD" href="' . get_bloginfo('wpurl') . "/xmlrpc.php?rsd\" />\n";
}
