MSA2312fc Killed Partner Controller

[Janet Estall]

From SMU ContA is showing up and ContB is showing down. ContA logged a 'Heartbeat lost' event.
'Killed partner controller. (reason: Heartbeat lost [failover reason code: 3]) EVENT ID:#A60265 EVENT CODE:84 EVENT SEVERITY:Warning EVENT TIME:2010-02-12 06:56:48'
ContA seems to have 'lost' ContB IP address.
Unable to restart ContB via SMU but can ping and telnet onto it and issue restart command but no joy.
Firmware is M110R21.
SMU 'Graphical' is showing error lights but visual check shows nothing wrong.
Logged onto ContA using SMU and reset IP config for ContB which it accepts then promptly resets to 0's.
Any help/suggestions gratefully received!!