CFBMC-4498: PSU & Fan failures on FAS2750

Issue

Autosupports report
HA Group Notification (CHASSIS FAN FRU FAILED: Multiple fans have failed) ERROR
HA Group Notification (CHASSIS POWER DEGRADED: Power Supply Status Critical: PSU2.) ERROR

BMC> events all
[IPMI.notice]: 01c8 | 02 | EVT: 6f01ffff | PSU2_Present | Assertion Event, "Absent"
[IPMI.notice]: 01c9 | 02 | EVT: ef01ffff | PSU2_Present | Deassertion Event, "Absent"
IPMI.notice]: 01ca | 02 | EVT: 0301ffff | PSU2_Fault | Assertion Event, "State Asserted"
[IPMI.notice]: 01cb | 02 | EVT: 0300ffff | PSU2_Fault | Assertion Event, "State Deasserted"

[IPMI.notice]: 0106 | 02 | EVT: 0157fecd | P2V5_STBY | Assertion Event, "Upper Non-critical going high" | Reading: 3.353 | Threshold: 2.706
[IPMI.notice]: 0107 | 02 | EVT: 0159fedc | P2V5_STBY | Assertion Event, "Upper Critical going high" | Reading: 3.353 | Threshold: 2.904
[IPMI.notice]: 0108 | 02 | EVT: 8159bedc | P2V5_STBY | Deassertion Event, "Upper Critical going high" | Reading: 2.508 | Threshold: 2.904
[IPMI.notice]: 0109 | 02 | EVT: 8157becd | P2V5_STBY | Deassertion Event, "Upper Non-critical going high" | Reading: 2.508 | Threshold: 2.706

::> system node environment sensors show
PSU2 Bad 	discrete 	fault 			normal 	TRUE 				
PSU2 	discrete 	fault 			normal 	BAD 				
PSU2 ON 	discrete 	fault 			normal 	OFF 				
PSU2 FRU 	fru 	fault 			normal 	MULTIFAULT 				
PSU2 Present 	discrete 	normal 			normal 	PRESENT 				
PSU2 5V 	voltage 	normal 	0 	mV 						
PSU2 12V 	voltage 	normal 	0 	mV 						
PSU2 5V Curr 	current 	normal 	0 	mA 						
PSU2 12V Curr 	current 	normal 	0 	mA 						
PSU2 Fan 1 	fan 	normal 	0 	RPM 						
PSU2 Fan 2 	fan 	normal 	0 	RPM 						
PSU2 Inlet Temp 	thermal 	not-available 		C 			0 	5 	57 	62
PSU2 Hotspot Temp 	thermal 	not-available 		C 			0 	5 	90 	100
PSU_FAN 	discrete 	fault 			normal 	FAIL_2