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CHW-1882: System reports "chassis over temperature" with HIC Temp sensor unreadable (na)

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Issue

The following is an example of the BMC "system sensors show" command or AutoSupport SP-LATEST-IPMI.txt

file showing the issue with unreadable sensors:
...

HIC1_TEMP0       | na         | degrees C  | na    | 1.000     | 3.000     | 5.000     | 101.000   | 103.000   | 105.000   
HIC1_TEMP1       | na         | degrees C  | na    | 1.000     | 3.000     | 5.000     | 101.000   | 103.000   | 105.000   
HIC2_TEMP0       | na         | degrees C  | na    | 1.000     | 3.000     | 5.000     | 101.000   | 103.000   | 105.000   
HIC2_TEMP1       | na         | degrees C  | na    | 1.000     | 3.000     | 5.000     | 101.000   | 103.000   | 105.000 


The following are example events logged by ONTAP:
 env_mgr: monitor.temp.unreadable:error: The controller temperature (HIC2 Temp0) is not readable.
 env_mgr: monitor.temp.unreadable:error: The controller temperature (HIC2 Temp1) is not readable.
 env_mgr: callhome.chassis.hitemp:error: Call home for CHASSIS OVER TEMPERATURE

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