Well, I can't tell what message 4275 is, since the zco log didn't have Http logging enabled, but you might try deleting the message whose id is 4275. To find out what it is, you can either enable http tracing and send another zco log, or you can go to a browser where you're logged into your server and do:
http://<yourserver>:<yourport>/service/content/get?id=4275&fmt=sync |