Hi Liz,
It seems you may not have the most current mbox.js version for Adobe Standard in place but no worry at all. Simply use the code below in an HTML offer with Target Classic and you will be all set:
<style id="flickersuppression">
"#primarynavigation_0_OuterRepeater_ctl02_liPrimaryNavigation {visibility:hidden !important}
</style>
<script type="text/javascript">
(function($){var c=function(s,f){if($(s)[0]){try{f.apply($(s)[0])}catch(e){setTimeout(function(){c(s,f)},1)}}else{setTimeout(function(){c(s,f)},1)}};if($.isReady){setTimeout("c=function(){}",100)}$.fn.elementOnLoad=function(f){c(this.selector,f)}})(jQuery);
jQuery('#primarynavigation_0_OuterRepeater_ctl02_liPrimaryNavigation > .contains-sub').elementOnLoad(function(){
$("#primarynavigation_0_OuterRepeater_ctl02_liPrimaryNavigation > .contains-sub").replaceWith("<a href=\"/us/en/support/manuals\" class=\"contains-sub slide\">\n Manuals & Parts\n </a>");
jQuery('#flickersuppression').remove();
})
</script>
Cheers,
Brian