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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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