Mailbox Server Upgrade to SP3

I am upgrading the last server to SP3 which hosts the mailbox role and is giving the following error

• ERROR

"Couldn't resolve the user or group "Mail.orange.k12.nj.us/Microsoft Exchange Security Groups/Discovery Management." If the user or group is a foreign forest principal, you must have either a two-way trust or an outgoing trust.".
[04/23/2015 20:35:43.0621] [1] [ERROR] Couldn't resolve the user or group "Mail.orange.k12.nj.us/Microsoft Exchange Security Groups/Discovery Management." If the user or group is a foreign forest principal, you must have either a two-way trust or an outgoing trust.
[04/23/2015 20:35:43.0621] [1] [ERROR] The trust relationship between the primary domain and the trusted domain failed.

I researched the error and the resolution is to disable the Discovery Search mailbox.

Are the following commands correct to disable the mailbox and run SP3 and then enabled and add permission?

• Disable-Mailbox “DiscoverySearchMailbox {D919BA05-46A6-415f-80AD-7E09334BB852}”
• Enable-Mailbox “DiscoverySearchMailbox {D919BA05-46A6-415f-80AD-7E09334BB852}” -Arbitration
• Add-MailboxPermission -Identity:"mail.orange.k12.nj.us/Users/DiscoverySearchMailbox {D919BA05-46A6-415f-80AD-7E09334BB852}” -User:”Discovery Management” -AccessRights:”FullAccess”

When I run the first command I get the following prompt:

[PS] C:\Windows\system32>Disable-Mailbox "DiscoverySearchMailbox {D919BA05-46A6-415f-80AD-7E09334BB852}"

Confirm

Are you sure you want to perform this action?

Disabling mailbox "DiscoverySearchMailbox {D919BA05-46A6-415f-80AD-7E09334BB852}" will remove the Exchange properties

from the Active Directory user object and mark the mailbox in the database for removal. If the mailbox has an archive

or remote archive, the archive will also be marked for removal. In the case of remote archives, this action is

permanent. You can't reconnect this user to the remote archive again.

[Y] Yes  [A] Yes to All  [N] No  [L] No to All  [?] Help (default is "Y"):

Should I Proceed with it?

Reference

http://www.msdigest.net/2010/11/sp1-install-fails-with-couldnt-resolve-the-user-or-group-mydomain-localmicrosoft-exchange-security-groupsdiscovery-management/

http://mostlyexchange.blogspot.com/2011/12/exchange-2010-sp2-upgrade-issue-with.html

https://vijayjadi.wordpress.com/2012/05/29/couldnt-resolve-the-user-or-group-microsoft-exchange-security-groups-discovery-management-if-the-user-or-group-is-a-foreign-forest-principal-you-must-have-either-a-two-wa/

https://junzho.wordpress.com/2014/07/22/apply-exchange-2013-cu-with-error-couldnt-resolve-the-user-or-group-microsoft-exchange-security-groupsdiscovery-management/