Smart Array P410i warning "Dirty Cache Line Unable To Flush To Drives"

[madods]

I get the output of:

hpacucli.exe ctrl all show config detail

emailed to me each day.

It now includes this line in the Smart Array P410i in Slot 0 (Embedded) section

Cache Status Details: A cache error was detected. Run a diagnostic report for more information.

As suggested I ran a diagnostic report which includes this warning in the Cache Config Status section:

Dirty Cache Line Unable To Flush To Drives

Can anyone tell me what I should fo to stop this warning being triggered?

The hpacucli.exe report includes no other errors. All the logical drives have status "OK".