It looks like it may be an issue with validation of file fields.
Try updating the line:
$WAFV_Errors .= WAValidateRQ((isset($_POST["Request_Quote_Form_group_Upload_Part_Drawing_gif_jpg_zip_tiff"])?$_POST["Request_Quote_Form_group_Upload_Part_Drawing_gif_jpg_zip_tiff"]:"") . "",false,3);
to:
$WAFV_Errors .= WAValidateRQ((isset($_FILES["Request_Quote_Form_group_Upload_Part_Drawing_gif_jpg_zip_tiff"])?$_FILES["Request_Quote_Form_group_Upload_Part_Drawing_gif_jpg_zip_tiff"]["name"]:"") . "",false,3);