Correct, I've run the command:
ipa-replica-manage -v re-initialize --from=<another-master>
... it completed successfully. The remaining problem is that this 'fixed' server
doesn't get updates from another master, the error is :
"Error (16) : Incremental update connection error. Backing off, will retry update
later."
As per this doc:
https://directory.fedoraproject.org/docs/389ds/FAQ/replication-update-sta...
.. this is considered temporary, I am afraid it's permanent in my case.
For now my work around is having cronjob that repeats "ipa-replica-manage -v
re-initialize --from=<another-master> " and this gets updates.