Hi,
go to DFM -> Monitoring Console, find the proper alarm and check it's properties -> Codebook.
This should show you details (if the alarm is still active).
Another possibility:
Install Fault History to your DFM (if not installed yet, it's downloadable from CCO) and use Fault History Report for the device. This should also show you the alarm details.
I've been receiving lots of these alarms in the past - the reason in my case was the default 60% utilization threshold on serial port and default bandwith (1548 kbps) considered on 2048 kbps line. But the real reason can be different in your case, of course.
Regards,
Milan