Back in the day when I was updating my website and had errors, Google Webmaster Tools took note of it and gave my sitemap files warnings.
Now I decided to start over new again by uploading brand new sitemaps with today's date stamped on them, and yet I still get the same warnings dated from weeks ago as follows:
When we tested a sample of the URLs from your Sitemap, we found that some of the URLs were unreachable. Please check your webserver for possible misconfiguration, as these errors may be caused by a server error (such as a 5xx error) or a network error between Googlebot and your server. All reachable URLs will still be submitted.
Some URLs in the Sitemap have a high response time.
Some URLs listed in this Sitemap have a high response time. This may indicate a problem with your server or with the content of the page.
I have fixed these issues now, but I don't know how to delete the warnings and make Google re-evaluate my website again. Anyone have any ideas?