https://support.microsoft.com/en-us/topic/kb2528583-list-of-the-bugs-that-are-fixed-in-sql-server-2008-r2-service-pack-1-72b9c864-6ff5-378f-f0dc-6cd27e8c0bcc
KB2528583 - List of the bugs that are fixed in SQL Server 2008 R2 Service Pack 1 - Microsoft Support
Lists the bugs that are fixed in SQL Server 2008 R2 Service Pack 1 (SP1).