This KB article provides a detailed, step-by-step guide on how to clear the alarm:

SRX-JTAC> show chassis alarms

1 alarms currently active

Alarm time Class Description

2023-03-26 02:33:21 UTC Major PEM 1 Not Present >>>>

• SRX-1500
• The alarm manifested immediately following the upgrade to version 21.2R3-S3.5.
• Notably, the absence of PEM 1 is a known condition, thereby indicating that this alarm is expected under these circumstances.

To address the alarm, follow these steps:

• Execute the following commands to clear the alarm:
  • #set chassis alarm pem-absence ignore
  • #commit
• Following these instructions will effectively clear the alarm and resolve the issue.

pem-absence