Bcm 450 alarm code 12407 fan speed issue

[SRC1]

I have a BCM 450 with the critical alarm code 12407 fan speed issue that still comes on even after replacing the Chassie fan. At first the alarm was coming every 15 mins so I replaced the chassie fan and the alarm slowed down to 1 or 2 alarms every few days at ramdom. Not sure if a patch is required or if there is something I not sure of. The system seems to work just fine except for this alarm. Any help would be greatly apperciated

 

[marice]

This is a known issue with the 450's that a patch can fix.

 

[marice]

Notes from BCM450.R500.SU.System 003.201002-1 BCM450 R5


- Factory redundant system fan alarm
The Fan Alarm is being raised and automatically cleared after every reboot.
The HWM FPGA receives a instantaneous reading of the fan speed that is 0 or very low, but the fan is still spinning normally.
Added some delay to the alarm to hold off alarming right away and check the fan speed for another minute and only raise the fan alarm if the fan is not turning properly within that minute.