Problem with Smart Array P212 Controller

[das711]

Hi All

My HP X1600 G2 storage server was running fine with P212 controller. Suddenly it reported cache error

Did try by replacing the cache, worked for a day and controller started reporting 

Controller self test failed

Tried by replacing both controller and cache , recogonized all the arrays and started to work 

Midway the system got struck, was forced to cold reboot from then on the following errors appears repeatedly

Controller Lockup due to previous failure

Controller failure self test failed

controller failure (Command=0h error=00h dlu=13:bh)

Even tried by replacing another cache, updated firmware to 6.62 still the error persists

Can someone help me to identify the cause 

thank you