How to replace faulty Flex 7510 WLC on HA

Hi guys,
I have a faulty secondary 7510 controller (on HA) and going to replace with a new one. How do I go about this?
What steps should I take?
Anyone done this before?
Thanks in advance.

You need the new WLC and configure as seconder with few basic configuration which i auto via start-up script. Make sure the settings are same on new WLC as before on secondary.
Mobility mac , redundancy port and MG are the same and remaining info will be sync on the secondary WLC and failover occurs when primary goes down.
More detail is given as below.
Ref: http://www.cisco.com/c/en/us/products/collateral/wireless/aironet-1130-ag-series/qa_c67-714540.html

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