SRX5800 -->minor alarm Mixed Master and Backup RE types?

Hi All,

I have buy SRX5800 with dual RE. May i know how to clear chassis alarm as per below:

root# run show chassis alarms
1 alarms currently active
Alarm time               Class  Description
2017-02-23 07:54:24 UTC  Minor  Mixed Master and Backup RE types

[edit chassis]
root# run show chassis hardware         
Hardware inventory:
Item             Version  Part number  Serial number     Description

Routing Engine 0 REV 03   740-056658   xxxxxxx        SRX5k RE-1800X4
Routing Engine 1 REV 03   740-056658   xxxxxxx        SRX5k RE-1800X4

Appreciate someone help