5508-HA standby in Maintenance mode

My standby controller is in maintenance mode. Other post say to simply reboot the standby but I'm worried about doing this during business hours. Say I did reboot it during business hours, would it affect the active controller? All redundancy links are connected.
(Cisco Controller) >show redundancy sum
 Redundancy Mode = SSO ENABLED
     Local State = MAINTENANCE
      Peer State = UNKNOWN - Communication Down
            Unit = Secondary - HA SKU
         Unit ID = 00:06:F6:DC:17:00
Redundancy State = Non Redundant
    Mobility MAC = 68:EF:BD:8E:61:E0
Maintenance Mode = Enabled
Maintenance cause= Negotiation Timeout

No it won't affect the active controller:
While booting, the WLCs will negotiate the HA role as per the configuration done. Once the role is determined, the configuration is synced from the Active WLC to the Standby WLC via the Redundant Port. Initially WLC is configured, as Secondary will report XML mismatch and will download the configuration from Active and reboot again. During the next reboot after role determination, it will validate the configuration again, report no XML mismatch, and process further in order to establish itself as the Standby WLC
http://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/7-5/High_Availability_DG.pdf
https://supportforums.cisco.com/discussion/11758901/ask-expert-high-availability-wireless-lan-controller-wlc

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    ============== Secondary controller===========================
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    Peer Redundancy Management IP Address............ 192.168.11.11
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    Peer Redundancy Port IP Address.................. 169.254.11.11
    (Cisco Controller) >
    (Cisco Controller) >
    (Cisco Controller) >show interface sum
    Number of Interfaces.......................... 5
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    service-port                     N/A  N/A      0.0.0.0         DHCP    No     No  
    virtual                          N/A  N/A      1.1.1.1         Static  No     No  

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