Hi,
Did you succeed in solving this issue? We have exactly the same problem. after running 2 weeks CPU usage is growing where msexchangerepl.exe is taking more CPU usage by every day. After running 4 weeks with the server the total CPU usage is 100% of the server.
We are running in an exchange 2010 SP3 DAG with 2 mailbox servers with 4 mailbox databases serving 1800 mailboxes and running 2 hubtransport/client access servers.
best regards,
Emiel