How do you migrate K2 .Net 2003 to a new SQL Reporting Services instance?

We are trying to migrate our old (and unsupported) K2 .Net 2003 server to utilize our newer SQL Server cluster and SQL Server Reporting Services (SSRS) environment. We managed to get the SQL Server piece working by using aliases so that K2 connects to the new SQL Server cluster, even though its configuration specifies the old (now retired) SQL Server. The reports in K2 use SSRS, but we have not figured out how to get it to connect to the new SSRS installation for reports. We have uploaded the reports, configured security, and configured the datasources, but we are at a loss on how to change K2 to point to the new SSRS instance. Has anyone had to do this before? Thanks in advance!