From a docs comment at https://access.redhat.com/documentation/en/red-hat-virtualization/4.0/paged/administration-guide/appendix-d-red-hat-virtualization-and-ssl#comment-1093241 "You should add a step before step 3 or modify that line to backup the apache.p12. If you don't and have an error, you can't go back and replace the certs without the apache.p12. Currently I am having some java trust issue after following these instructions and experienced this (I ended up reinstalling since it's a home lab). I'm sure I'm not the only one who would have this happen."
Updated on the same Git branch as the work for BZ#1336845; currently waiting on tech review.
Checked that the step now includes backup wording. Moving to VERIFIED.
Now published at https://access.redhat.com/documentation/en/red-hat-virtualization/4.0/single/administration-guide/#Replacing_the_Manager_SSL_Certificate