I am looking for a TID or instructions on how to perform upgrade of my 11.3.2 ZCM environment

I had 1 ZCM 11.3.2 server Running on Win Server 2003 32bit. Stuck at 11.3.2 because of OS architecture restrictions

In preparation for moving to 11.4 and up I introduced another server Win 2008 R2 64 bit running 11.3.2 also. Both have been running in tandem for a couple of months now - obviously in the same Zone.

There are numerous documents around on promoting Secondary to Primary, or performing DR process to replace primary with secondary, exporting and re-importing zone certificates etc.

I attempted this before and had to open an SR to roll back as it didn't work.

Essentially what I am looking for is documentation to proceed with my system upgrade and end up with the 2 servers, in the same Zone so I may continue to upgrade to >11.4. - Obviously with the least pain.

I will be happy to provide any further information for clarification.