Anyone seen this before?

Status is OK now, but if this is a sign its about to fail should I proactively replace this PS? (8.1.2)

        Jul 29 12:03:34 na02 Jul 29 12:03:34 [na02:monitor.chassisPowerSupplies.ok:info]: Chassis power supplies OK  

        Jul 29 12:03:30 na02 Jul 29 12:03:30 [na02:monitor.chassisPowerSupply.ok:info]: Chassis power supply 1 is OK  

        Jul 29 12:03:30 na02 Jul 29 12:03:30 [na02:callhome.chassis.ps.ok:info]: Call home for CHASSIS POWER SUPPLY OK: PS 1  

        Jul 29 12:03:24 na02 Jul 29 12:03:24 [na02:callhome.chassis.power:error]: Call home for CHASSIS POWER DEGRADED:   

        Jul 29 12:03:24 na02 Jul 29 12:03:24 [na02:monitor.chassisPower.degraded:notice]: Chassis power is degraded:   

        Jul 29 12:03:23 na02 Jul 29 12:03:23 [na02:cmds.sysconf.validDebug:debug]: sysconfig: Validating configuration.  

        Jul 29 12:03:19 na02 Jul 29 12:03:19 [na02:callhome.chassis.ps.degraded:error]: Call home for CHASSIS POWER SUPPLY DEGRADED: PS 1  

        Jul 29 12:03:19 na02 Jul 29 12:03:19 [na02:monitor.chassisPowerSupply.degraded:notice]: Chassis power supply 1 is degraded: PSU1 Fan2 Speed is Unreadable  

thanks