SL8500 DC power supply intermittent issue

Hi,

When I checked the SL8500 event log, its showing an intermittent failure issue with DC power supply. But all DC PS are in green state, no amber light on each PS.

see below log:

I think, the correct status should be: Status: <PowerFail = false><acOk = true><dcPowerOk = true><present = true>

but, why there are no amber light?

current firmware version: FRS_4.73

-----------------

                     Time : 2015-04-13T15:00:32.316

                     Device Address : 1.0.0.1.5

                     User :     root

                     Requester :  default

                     Activity : internal

                     Request Id :        0

                     Level : error

                     Result Code : 1321

                     Text :  "Failure from power supplyAddress: 1

                     Parameters : 0,0,1,5 - Status: <PowerFail = false><acOk = false><dcPowerOk = false><present = true>"

                 

              

                     Time : 2015-04-13T15:00:32.386