[c-nsp] 7513 RSP4+ SSO Failover Question - 12.2(25)S12

[Gregory Boehnlein]

Hello,
	We're running a Cisco 7513 w/ Dual RSP 4+s in SSO mode. IOS is
version Version 12.2(25)S12. We received a notification of an SSO failover
from our Master RSP to our Slave. Prior to the failover, I had been doing a
BERT test on a T1 riding on a PA-MC-T3. You can see from the logs below
where I cleared the logs. About 30 seconds later, the BGP peer on the other
side of the T1 I was testing on came back online and then 3 seconds after
that, we got the message.

Feb 15 00:50:57: %CLEAR-5-COUNTERS: Clear counter on interface
Serial10/1/0/2:0 by n2net on vty1 (207.166.192.127)
Feb 15 00:51:13: %BGP-5-ADJCHANGE: neighbor 207.166.197.25 Up 
Feb 15 00:51:16: %RSP-5-SLAVEUP: Slave changed to state Running, Buffer
memory state : disabled
Feb 15 00:51:16: %HA-5-NOTICE: Standby (slave) configured to run hw-module
HA image "slot0:rsp-ik91sv-mz.122-25.S12.bin"
Feb 15 00:51:17: %HA-5-NOTICE: Loading Standby (slave) image:
"slot0:rsp-ik91sv-mz.122-25.S12.bin"
Feb 15 00:51:23: %IF-4-BACKWARD_COUNTERS: Corrected for backward rxtx_errors
counters (897 -> 896) on Serial10/1/0/20:0
Feb 15 00:52:51: %RSP-5-SLAVEUP: Slave changed to state Running, Buffer
memory state : disabled
Feb 15 00:52:51: %HA-5-MODE: Operating mode is hsa, configured mode is sso.
Feb 15 00:53:18: %ISSU_PROCESS-7-DEBUG: Peer state is hot redundant
Feb 15 00:53:23: %HA-5-SYNC_NOTICE: Standby has restarted.
Feb 15 00:53:24: %HA-5-MODE: Operating mode is sso, configured mode is sso.

Things look normal, and the RSP4+ in slot 6 is marked as active.

core-ar1#show redundancy debug 
Operating mode is sso
redundancy mode sso
hw-module slot 6 image slot0:rsp-ik91sv-mz.122-25.S12.bin
hw-module slot 7 image slot0:rsp-ik91sv-mz.122-25.S12.bin

Active High Availability version is 3.0
Standby High Availability version is 3.0

Active is in slot 6
Standby is in slot 7

The system total uptime since last reboot is 10 weeks, 3 days, 13 hours 50
minutes.
The system has experienced 0 switchovers.

There doesn't appear to be any switchover history:
core-ar1#show redundancy switchover history

I'm thinking that the Slave in slot 7 crashed and rebooted, but I can't seem
to find any logs that would indicate it, other than the messaged in the
system log. Any suggestions? Ideas?