When the service processor clears a power supply fault, it also erases other fault records. This might happen:
When you hotswap a power supply. However, you can preserve the information by creating copies of the other faults.
Occasionally a power supply fault clears itself. When this happens, the information about other faults might be lost.
Workaround
Perform this procedure before hotswapping a power supply.
Save your fault information immediately when you see a power fault, and before hot swapping a power supply.
In the web interface, this information is located in the Fault Management tab.
In the CLI, this information is in fmadm.