InsightIQ 'simple' upgrade from 5.1 to 5.2 fails pre-check "There are 1 unhealthy pods."

When running the upgrade script ./upgrade-iiq.sh on an InsightIQ 5.1 'simple' (VMware OVA) it fails with:

[2025-04-15 12:12:19] [INFO] All nodes are in a healthy state.[2025-04-15 12:12:19] [INFO] There are 1 unhealthy pods.[2025-04-15 12:12:19] [INFO] Some pods are not in a healthy state. Exiting..[2025-04-15 12:12:19] [ERROR] [PRECHECK] Failed to run precheck, please run showupg --log to see more detailed logs.[2025-04-15 12:12:19] [INFO] [PRECHECK] Pods were not scaled down. No scaling up required.

We know nothing about Kubernetes, and have little desire to.

The command :

kubectl get pods -n atlantic

 which is suggested in the documentation shows a list of objects that are all 'running' except for one :

clustermanagement-nfs-d75d6f57b-k74gc                 0/2     Init:0/1   0              24h

Running the script again (as suggested) does no better.   The credentials are good, diskspace is good.   We just upgraded our one PowerScale to 9.7.1.7 and we knew that 5.1 was not compatible (and indeed monitoring is broken).  So we would rather like to be able to upgrade to 5.2.

We would raise an SR but it seems that InsightIQ only has telephone support.

Has anyone any suggestions where to look for 'unhealthy pods'?

Thanks