PSU reports critical status with SHELF POWER INTERRUPTED alert

[Node-A: statd: monitor.shelf.fault:alert]: Critical fault reported on disk storage shelf attached to channel 0a. Check fans, power supplies, disks, and temperature sensors.
[Node-A: statd: callhome.shlf.fault:error]: Call home for SHELF_FAULT
[Node-A: dsa_worker4: ses.status.psError:alert]: DS212-12 (S/N SHFNCXXXXXXXXXX) shelf 0 on channel 0b power error for Power supply 2: critical status; AC Fail. This module is on the rear of the shelf at the bottom right.
[Node-A: dsa_worker4: callhome.shlf.power.intr:error]: Call home for SHELF POWER INTERRUPTED

• The below errors are seen on the storage shelf:

Cluster1::> storage shelf show -errors

    Shelf Name: 1.0
     Shelf UID: 50:0a:09:XX:XX:XX:XX:XX
 Serial Number: SHFNCXXXXXXXXXX

Error Type         Description
------------------ ---------------------------
Power              Critical condition is detected in storage shelf power supply unit "2". The unit might fail.
Voltage            Critical error detected in voltage sensor "4". Sensor is located in the rear of the shelf on the                    lower right power supply.
Voltage            Critical error detected in voltage sensor "3". Sensor is located in the rear of the shelf on the                    lower right power supply.

• The power supply status is reported as failed in storage show fault output:

Cluster1::> system node run -node <node> -command storage show fault

Enclosure Status: unrecoverable
Channel: 0a
Shelf: 0
Shelf Type: DS224-12
Product Serial Number: SHFNCXXXXXXXXXX
Module Type: IOM12

Power Supplies:
Element Status         Status Bytes  Status Descriptions
  1: OK                01,00,00,20   RQSTED ON
  2: CRITICAL          02,00,00,F3   DC FAIL, AC FAIL, OFF, RQSTED ON, FAIL
  
Enclosure:
Element Status         Status Bytes  Status Descriptions
  1: OK                01,00,02,00   FAIL

• Environment status reports:

Cluster1::> system node run -node <nodename> -command environment status

Channel: 2a
Shelf: 11
SES device path: local access: 2a.11.99
Module type: IOM6; monitoring is active  
Shelf status: unrecoverable condition
SES Configuration, shelf 11:
 logical identifier=
 vendor identification=NETAPP  
 product identification=DS4246
 product revision level=0211
Vendor-specific information:
 Product Serial Number: SHJSG1234000011
Status reads attempted: 9955419; failed: 0
Control writes attempted: 0; failed: 0
Shelf bays with disk devices installed:
  23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0
  with error: none
Power Supply installed element list: 1, 2, 3, 4; with error: 2
Power Supply information by element:
  [1] Serial number: PMW87654321D3DE  Part number: 0082562-22
      Type: 9C
      Input voltage: <N/A>
      Firmware version: 0311  Swaps: 0
  [2] Serial number: PMW87654321D801  Part number: 0082562-22
      Type: 9C
      Input voltage: <N/A>
      Firmware version: 0311  Swaps: 0
  [3] Serial number: PMW87654321D757  Part number: 0082562-22
      Type: 9C
      Input voltage: <N/A>
      Firmware version: 0311  Swaps: 0
  [4] Serial number: PMW87654321C2DD  Part number: 0082562-22
      Type: 9C
      Input voltage: <N/A>
      Firmware version: 0311  Swaps: 0
Voltage Sensor installed element list: 1, 2, 3, 4, 5, 6, 7, 8; with error: 4
Shelf voltages by element:
  [1] 5.01 Volts  Normal voltage range
  [2] 12.03 Volts  Normal voltage range
  [3] 3.02 Volts  Normal voltage range
  [4] <N/A> sensor condition <N/A>
  [5] 5.01 Volts  Normal voltage range
  [6] 12.03 Volts  Normal voltage range
  [7] 5.01 Volts  Normal voltage range
  [8] 12.03 Volts  Normal voltage range